Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc491e7b2341b87…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 14:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dffbba22606861616c96934c466b92aa SHA-1: e589e297e620434a6feb28dae48bdd965b16a15c SHA-256: 9fc491e7b2341b87b21100d7ac92cef2f176f0fa5befbf5b4d4880733d8fe39e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The presence of external URIs and a link farm structure strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dialogueinpraxis.net/files/docs/zalerojolikimizedi.pdf In PDF document text
    • http://savalis.ru/userfiles/file/84793928567.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/94765071279.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/merudinaduxomax.pdfIn PDF document text
    • http://dzbnf.com/upload/file///feluj.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/63095c972765d6fda58bd968d376abed/15930877799.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1094db34---74161184519.pdfIn PDF document text
    • http://temple.mo/userfiles/file/20206715908.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/tufemotudamipaduma.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/08ec21a2a0664d350332a441ae6516a2/96800258400.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/96201321880.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba933e16ea1---99738229917.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/abbcc5ef668589315bb3167d9b28d394/munivo.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210829230241.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/74858089106.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/89bb92ecb6efafa6d68c3624052bf9f2/1904537727.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607952a46029c---82206154724.pdfIn PDF document text
    • http://fpole.ru/sadm_files/66240187112.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e722f2c07---gimeninetoxufokumojumuxiw.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856beb5d49e---xufizanadekuxed.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/6884294597.pdfIn PDF document text
    • http://rld-carbon.ru/file/toborifunilusipomaneta.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/77814642128.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1129212293---3439087397.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/356feb23bf3dafdcf1c5e2280579f0bc/nisitefifalimutoriralubix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pathfinder+pawns+bestiary+box+5+pdfPDF 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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 17676 bytes
SHA-256: d097150002a761625158d9eeb1471b330010551a9ccf0e06a7e3dfa0903e1140
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 11128 bytes
SHA-256: 4a5c514dd0105f68f0777fa25bb07c5e46862877ead740f9bdc5259267503608