Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e3fb3d17032036…

MALICIOUS

PDF

87.2 KB Created: 2021-08-23 13:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: feef5c251975dc8e469887ea1c953744 SHA-1: ed9b694dd7a737e787f9f9ab71928536fb5faecd SHA-256: 75e3fb3d17032036806727ca8e86c794cd991c77bb8a3defc82f8f38559ec03e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm used to distribute malicious content or phish users. The PDF structure itself appears to be a lure, with no readable document body content, further supporting its role as a malicious artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/menugpotpt4ns2obv4elmgjr31/lefivoganabirokijenudinat.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452e809e5e---49918654128.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca25f40292---rurivoma.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/kuxumenojesivomofobufini.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1ff4b0a17e23177bfd70dfe600dc362b/94523051897.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/polivanolowadam.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a61d6ebb2c4e3ec402dc870f10595875/96044599258.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160895862bc05a---26541530271.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/32828689454.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ba003138---53671061994.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202108230406111742.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/53813813192.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b07d3d52---bajumakunuviwobul.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5e40bc87e56be7709892911827aa3b56/lefowafofusoloxatenipiz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607729b546b80---45729806358.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789492126ab---8892444803.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/pukenowunusapugokozobaf.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/20040546968.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xokenupifivuv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/raetilgqrmm1i3lu4pba0ovcv0/raxinumixapus.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/54549703292.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/16233687608.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/1600815184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2.2+forming+questions+in+spanish+preguntas+answer+keyPDF 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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 17312 bytes
SHA-256: ebfea202d09c611205a9ffd09cc37be6b02ec1d78abf521eca4e2d630bdd2f63
font_01_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 11388 bytes
SHA-256: 7172cfefbc88cb04e1582e1fbe32098ff3a08d980fd877523406f795a2b15c24
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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