Malicious PDF — malware analysis report

Static analysis result for SHA-256 995b1282e73fa1e4…

MALICIOUS

PDF

85.9 KB Created: 2021-07-15 21:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c79e09b637baba46c98e4501d8ce78b4 SHA-1: bd5f72b8f18b2f2666b061bf40f7f801c03de90a SHA-256: 995b1282e73fa1e4468c70580827269e9b83c2e41303c1524955d6eb487c1c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=12am+edt+to+cst
    • https://daaeportrett.no/upload/file/77925289729.pdf
    • https://dynasty888.com/image/files/20210626_181150.pdf
    • http://dailymaydemtien.com/userfiles/files/69386605539.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1570fbc7b2edf4bc1af57fb363c12d17/fosewelunebimolareteza.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0aa866e37c258c1046b32006fc919deb/virovebodikojum.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9505fa91cb---24696618066.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be301ecee---29560737335.pdf
    • http://asupuro.com/user_data/image//file/wuxifovodugujow.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9e03841b6effa29be79dd9624aac184d/gumipabafetikuvire.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e4260cc4---19656081334.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/bavomimimanupibamo.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a9d1afe12---gijobutemikexezevejaw.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/70d847a8f6ddcd0d0a784f9f5277d9ef/44720316145.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d45ea0974512d67b7d02984ad3dfed22/61503752984.pdf
    • https://etonbio.com/newsLetters/images/file/tuludujurabetasefe.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jmdgkhfhps1idj2i4ulnidqlrd/zapuxekopu.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3v06n8makqvc3mjia3lpt1hmsc/50050199498.pdf
    • http://all-pass.com/folder/editor/file/57512485379.pdf
    • http://greenbrier101.com/userimages/67293735009.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609137be2d001---tuxorewoserunixad.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d249c1c058b---puzumolirasosatinetovozo.pdf
    • https://juhaszautovill.hu/userfiles/file/pafiwanuvatisepufe.pdf
    • https://dagvandearchitectuur.be/_files/file/73549498954.pdf
    • https://swift-tw.com/lcc/upload/files/mexumodawovemumoga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed46.bin
90f5d6fcd5e182d32bb6a47285479a3bfd725b8d1c964e11a2fe575a91dafd34
pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 17844 bytes
font_01_sfnt_off00011b2b.bin
e9976f67c5c4b041abb5c91b37218d71ed21e7ceae4f10a76ec73244466f808e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 10264 bytes
font_02_sfnt_off0001325d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 16792 bytes