Malicious PDF — malware analysis report

Static analysis result for SHA-256 86278a4d4da77907…

MALICIOUS

PDF

103.6 KB Created: 2021-07-09 00:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b742f45319863f64a4fcf82ffca0e5b SHA-1: b9cea811c3f9d4990dab1c11bf377a4621d3e908 SHA-256: 86278a4d4da77907cdce69c50132bedcc1a9f4db89660a00cb3e632640feab99
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

The PDF contains social engineering lures designed to bypass security measures, instructing the user to disable antivirus and execute commands, consistent with ClickFix attacks. Multiple heuristics indicate the document is a link farm hosted on potentially compromised or disposable domains, likely serving as a lure to download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://newo.ru/files/files/63648907186.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ce6abb97c1a1df3e00cd48079d391284/51105330096.pdfIn PDF document text
    • https://thechoose.it/file/jakewugudisimuzup.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b68f438f1---54638826062.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/61879891123.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c4eec66da---3455870011.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d2055f0e---xapalegakebutomakur.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nituwanitasubirafugipu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6de820e930e3587cc4ac9f08ab34ec67/28879059480.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff7cf1050---ninajodelutazolul.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/87647459181.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bb9da271b8977791854d19c170251547/fewap.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/19579868055.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c83b60d49890397114e3385311dc4841/vegenabeziwenobaletowopum.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/9292493643.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ff61beb8---zukovedogujisipegunes.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6b681dfa---39551906512.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/41594904564.pdfIn PDF document text
    • http://rentaruedas.com/files/others/66736150808.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/47eb88fec7599e6a53d2293124cfc9f5/kadeposelipoxiwadi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7bf56f5c---57661913323.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9367ccb3d4726e4e2e1729f7d32ebb4f/sorefikato.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pmoekkfel5oas5bcmbg0e7e5h4/lotosilo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/21373144842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=usb+device+not+recognized+port+reset+failedPDF 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_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B3 11068 bytes
SHA-256: f93a79da263c373af459fe4011bf01a0d6140e11caba9b01ae3eac6d20381700
font_02_sfnt_off00015f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F38 18692 bytes
SHA-256: 9a7bfb82c7bcb6455a0c021ac413af4de6ce1800ea649147311cc9332a0cd147

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