Malicious PDF — malware analysis report

Static analysis result for SHA-256 070355006b4a1110…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 17:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f82ac011b8b319d86053994ba2cb7b94 SHA-1: d16760af3b2fb103f29dae1882c794be4fdc6da1 SHA-256: 070355006b4a1110eec227eaef93c9be42adc857e77db240dacb5bfa883ee273
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The document body is unreadable, but the heuristics suggest a lure involving urgency or callback phishing, consistent with the overall malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/h6pote1qtrc4a2avd3rc7phbp0/98972022453.pdf In PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/vufagozezexorabotimaxe.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/69283840958.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/begorura.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/remedulomuwepetijet.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/xewufatigutidejamulefo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/semigumumazalumoxupojal.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/91bingsbd8gf5q4og57skoeuv3/34790524979.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/67f8e99bc2c91990ab9b7089409fa226/43374376316.pdfIn PDF document text
    • http://4bx.pl/public/file/jizitodolisowolekadimopug.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/90361284237.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/91702914824.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xeteludumiruzesi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sa1sjil28sksiomhr268rr6d7u/84272374618.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/14134656018.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6827af12---wazar.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/h2gteof579pdcmed3qioa0g6p0/549085831.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3dlp45hb8nmnhf4p8e2frlevb5/gupamozesazuluzunopejo.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/80025442937.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/39117160832.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943185a80b---20728532626.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff5f3f349---vokipesazajirokanivenugi.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/madisufifos.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/949551ab1cf6c7ebf3d64e6a9670151c/10843080547.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8sja8e8d6jeg0l7oe3km3ogfad/47666796235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sanford+guide+for+antimicrobial+therapy+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11328 bytes
SHA-256: eec4703ff4c5a2c7a0088797eb4448f58c133b2d1cea9c5691faafffb7919d14
font_01_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 17448 bytes
SHA-256: f69bd8df58555f00a459f8c329bd916b56ba0b4f3c3567879339a0abeef084fc
font_02_sfnt_off00013823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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