Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd8cf2b99262e0c…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c55633f1f2eea3bdad49fa077955ed15 SHA-1: 77e53cde4ac4633b3bfba6475914846c0d86f90a SHA-256: bfd8cf2b99262e0c4c37b2fa0399ffbf0fc43effbdcb775679d4f68900e33f2d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress installations and potentially malicious content hosted on disposable domains or IP addresses. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8146633f0---xeminisugixosigusu.pdf In PDF document text
    • https://jotekonybakterium.hu/userfiles/files/91034862814.pdfIn PDF document text
    • https://ahha.az/userfiles/file/18425620369.pdfIn PDF document text
    • https://chp-travel.ir/data/file/17121336901.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/962384777b397ee0deb3947d225e82b7/66923289320.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/50870637971.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/sarajesepo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d85f088f403---raseforazev.pdfIn PDF document text
    • https://aedwea.com/upload/foto/17128886360.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/xezigumabikitas.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/wigajosadev.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6e2e6ae72---zimixa.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f79842de63d623da28d7bacb04a18b4e/18910340479.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fa0403d9290299d2c10cce225ca85cdd/mariketowuv.pdfIn PDF document text
    • http://cbstav.cz/file/56692881355.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e17c282472b---pagumafiliwabesev.pdfPDF link annotation
    • http://www.tractortools.cz/ckfinder/userfiles/files/7566999832.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/33975349285.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ca324dbd684908df596f699d99931223/sumik.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/pitogonota.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8826c8e0d8e5605ade2fe68f0027176d/65493076037.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/moterebovun.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28956292109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=johannes+gumpp+triple+autoportraitPDF 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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 17464 bytes
SHA-256: 49a56c4d6edfd1dbb18769b4f9d285adbc0eacff8bf0942d6027255a95f0b935
font_01_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 10788 bytes
SHA-256: 67e301b001e16705f8addfd8c2e72b6b5afca84bfed1eded43c413c3ab78e15c

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