Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bff220199c1f94…

MALICIOUS

PDF

103.2 KB Created: 2021-07-01 15:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 29ea15ec11efc0895c06b347d2600a2c SHA-1: e57bfd6c224516a794a9d45e085ddfe48188e4f1 SHA-256: 36bff220199c1f94c1f9465ad8e000464c5e8d1bdd4f3b4f68d5b233bdab32c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://fajanav.com/aym_image/files/numifev.pdf In PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/015403326cea2c42619a2cad88295027/29994442218.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73d147e53---kixevisogavoxulusupuwu.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/75710658056.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/06286e90df55f7672ab72d5bcf421548/sajitolajawunusanelun.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/83015388710.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/505ab9d2686c5ac905d9c870f0d5117b/simema.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609868811c0cb---vokanupivunerozipiravine.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3269f57d6cb414b58182dabc3d38c6ac/9368237161.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804faada10d---39916973186.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/kuzumuwimupinupi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b210f55fbb---vexapod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac25798de---13355617698.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c3d7593494519a149014e2d8e7d2c74f/powejepamokerebafe.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hv21bbvad8clt8frbfg56m2tt3/34476560633.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160839c9d60ac0---88544007444.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3afd42d9b4---72979480563.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a23b73a59e74ea73f90e22a3463eb9a2/roroja.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854fcb2ee0b---49349740732.pdfIn PDF document text
    • https://tomas-music.com/contents//files/puwuxigimuxumugiti.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3443d28d2a---83487011648.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5e1f8e90c7b24b455f96512808cd8c4e/tilipupidirugibevo.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/zaxisokejewemurotom.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/pdne08pdnhu1k4eia8q5oeaft3/80515075681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=friction+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016bd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16BD6 19552 bytes
SHA-256: 18ded7bd234819467573250cef5efc712160f33f8987562188f1d84987d42f6f
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 26968 bytes
SHA-256: 6d6bb8ff491438becf02d479bafc5c8ffcde2c1f34266cc7d7aa6d95fa818d2c
font_02_sfnt_off00014449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14449 4356 bytes
SHA-256: 123cc490b93f6d03c9e75a66ae4609ec07d50a516663ea388bccec386acfb037
font_03_sfnt_off0001546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546A 10384 bytes
SHA-256: 5e41f4b39fa1a389abd64bd8f1c7764d176d82608da49048960669c9666350cc

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