Malicious PDF — malware analysis report

Static analysis result for SHA-256 4882ea1f7a221d0e…

MALICIOUS

PDF

84.0 KB Created: 2021-08-02 15:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef3f9ab5b17f0ee1c3be89a32f29f96d SHA-1: 07cac733b353fefc849911ddd6218c91e3a043d2 SHA-256: 4882ea1f7a221d0ef69fccb43cc4d1dbc0959229bd755e430e8e9ee51c5c032e
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and callback phishing indicators further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dfbd643cb---gutumewuwoj.pdf In PDF document text
    • https://hasekei.jp/userfiles/file/jivoluxos.pdfIn PDF document text
    • https://mihalex.by/files/files/tiwikarafadiginuruzilijes.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/20149435172.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/dudatadozudoparit.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee20b0d2---bogebixaveba.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106131ba7df9---kejogewibikivus.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab13bc4e81---tapuv.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/46532749716.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160978f5596249---firalo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/nasosawuma.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/8157452069.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d967f386f---1721819228.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/odhqkan4p04f0j0ctjc7aatdp1/powunedumoxejawo.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b9ce18c3c2fe6a16a09c7988c036685e/95407175173.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6ef2893caaaf2a92c8d5ac5c1318c1bf/fisuwofofikanufukura.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/zogezonazudona.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/58979a6ba529482f9599f677dc4438e2/sofawaluxuximoluzag.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/35303719864.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/d97snh50dr1qubv46dupmclh2d/fuxofamaporukufofopiw.pdfIn PDF document text
    • http://huntland.hu/upload/file/74168262276.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3c3f7534a96c8c3142c9ebe0a2ae3576/novixajululiju.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xoveropita.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/jadetaparet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ssc+je+polity+questions+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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10916 bytes
SHA-256: 43af174842301f5c363488da69b8a78473d720a136aff78de372a9ca2193bf09
font_01_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 17616 bytes
SHA-256: ab69592a1dd73ac0c676fc8e16d812b7f2e255de223a2750ee210a4703cb8e85

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