Malicious PDF — malware analysis report

Static analysis result for SHA-256 8befb9e4cc40d2ec…

MALICIOUS

PDF

124.5 KB Created: 2021-07-08 11:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa4496c1ffa98be15bfe9d321b01de0 SHA-1: 4c4116bee503c7e16b98bd1704c2676b747a98a6 SHA-256: 8befb9e4cc40d2ec9d178ae733829cb24feb5b47fcad48249ef9f712c2e12815
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF that contains a link farm pointing to compromised WordPress upload storage, suggesting it is part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple unknown URLs associated with PDF downloads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911cc78c9a3---zaboge.pdf
    • https://angelsstaff.com/uploads/file/47764676684.pdf
    • http://copy2d.com/ftp/image/file/18402845195.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bf1826e7---rirevod.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2dc684a918890492d46adc9923196a55/83356500671.pdf
    • http://tgtech-auto.com/userfiles/file/30683136801.pdf
    • https://nikosdimos.gr/userfiles/file/39162161547.pdf
    • https://aartipalette.com/userfiles/file/kefafifejegatuke.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/zevomewe.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f9964d75---30227858417.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609418239b8c0---jarekamabamawelajojebul.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1f61d1ebc9c453a6517b649fde4a4059/tuvutiwamovalatedetir.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/jedalaw.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ff3d87316686e208b3a5414ebc84f39c/62907057931.pdf
    • https://cakenepal.com/userfiles/file/29715086338.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23c50da7f---17274962962.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3edcae1f00---vududujedisutatebove.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a0a96278---60007602584.pdf
    • http://bezagsecurity.cz/userfiles/kemuwuwanoreruxarafuwix.pdf
    • http://nowyhotelik.pl/userfiles/file/61923246011.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/omlfvg8fkd8enq0ps61pvb8obf/80190559426.pdf
    • https://jamurgoreng.net/contents//files/98368388063.pdf
    • https://renault-service.com/userfiles/53430144922.pdf
    • http://beiwendq.com/userfiles/file/bugidikape.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a79ede86---55575225578.pdf
    • https://0286869143.com/editor_images/files/kanizopolubogude.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=catalysis+of+the+reaction+between+zinc+and+sulfuric+acid
    • 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_off00017b3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3D 16792 bytes
font_01_sfnt_off0001934f.bin
bcd79488f070f7ac5a90ecf5498ab253a0c35d0dcc4753e5f723290b37cf7ccb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1934F 20560 bytes
font_02_sfnt_off0001c9ea.bin
ef6adf818918402381ccca6e53a82214fd1d84f7ca177d600b0232deac25d89f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9EA 11104 bytes