Malicious PDF — malware analysis report

Static analysis result for SHA-256 381caba469b5f7d0…

MALICIOUS

PDF

96.9 KB Created: 2021-08-07 14:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1438774ee5de2c01a36b4289e6354fe2 SHA-1: a0c1569fc193ea9c0d683bb8289959afbc731e0e SHA-256: 381caba469b5f7d04f3f894f025d412c0eb47962fd2974b6a0e8e2f479b29e7a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tasskctbhlinl1ioijpl2e73d1/nuvogesovogakadixobalova.pdf In PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/femijerukenarusumaji.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0b3b3dcb61c2aa124bbedbc0c5bc8c12/zadepojereninet.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a280bab3db5aef61d1e28cae61b1289/letis.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3733_20210801044228.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/638hhm1n43bibj8ltda12rtcf4/loxakenekamububo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/rowavopawidezuw.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/duwodilo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/95fb4ee23e406d505739dff762034488/2983105749.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea3ae954f---majazakud.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/rerewufedipamuravujowexi.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kixaliwomikikokemeg.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa240e6e345---dumasulifizotolegakaf.pdfIn PDF document text
    • http://1careglobal.com/upload/files/sijuganizunexemiropop.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9b4fb2360b96867c763f2a05d70cb1a2/88488489234.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16105b9db5ddf2---23610784331.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/j7ieu5kofj40uuphrm8rd02l46/lupajoxozu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c20ec597d98---gusilegatawoj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609408d0ea3c6---linolamufixaliv.pdfIn PDF document text
    • https://parfumzone.ro/files/file/35582510332.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kupewadulapulopivi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/86238b90580a3a3b2e9791e0d8a4f039/64092606286.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb4a24e278---faduwebemenetituvi.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc44c924---tukitosatokejodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=it+all+adds+up+worksheet+5+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_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 10872 bytes
SHA-256: 6334c312d995d88f259e6c64c14b306f4d2f45bbe89dad5e6231a7fe09717c29
font_01_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 17544 bytes
SHA-256: e49effc8b2bf7cb561e1b4bf180481faba7d059c3fc44f166052bd29c395f155
font_02_sfnt_off00015adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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