Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b38f7e13ffe8b…

MALICIOUS

PDF

100.2 KB Created: 2021-07-06 15:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 908a031130f8335de4b64d143107b3d3 SHA-1: 82e78f07e634284bbfc8630250a67feb4224ae47 SHA-256: 8f4b38f7e13ffe8b6fe9086cf870d653651bedaf86a304c041261b0082e2675d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a callback phishing lure heuristic suggests a potential social engineering component. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://pistant.ru/uplcv?utm_term=the+social+responsibility+of+business+is+to+increase+its+profits+summary
    • http://www.hangmandigital.com/files/file/kedol.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jhem25sl5okb7na1u5osuon2l3/tesanamomuvukebog.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1ce73dc65bdba4ab0365833faf58efa/zuvusurujidofimu.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3b3f2d9f4---31130700343.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/802302c8e5ee9f2f38e2f82676400650/girexo.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517135237770464.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/fukaxanizunaparen.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7e8mbs55lskvdeh43okt0ktkpa/93117689907.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210618145448.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608094673afdb---72447898199.pdf
    • http://giaodantanthaison.com/Images_upload/files/zosove.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5bb3f3e6cfab137df59f05fa6781fb37/38596674427.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075cde60d2b0---3598025305.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e2d66ce08e0b8456a9c2702f31b1c44d/16966913225.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb03fee7de---41916225856.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/l7b8ne0jr66alueiu7v9fhci33/gokil.pdf
    • https://alnahamgroup.com/userfiles/file/3186423647.pdf
    • https://ntwbearing.com/UserFiles/File/fiwajunowujegibifej.pdf
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/64291453260.pdf
    • http://softwarefactory.nl/images/file/25919841212.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089150f9add0---ritarabewelapugize.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/33898141166.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0c32891e1f6a981fc656d2977c514083/44239504034.pdf
    • 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_off00012246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 16792 bytes
font_01_sfnt_off00013a5d.bin
40e2a4759a568984b666683c2c47242906d1eba05265355fcce339002ccfddc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5D 11064 bytes
font_02_sfnt_off000153c2.bin
a480c024c6553734b894bdea8209ac113db781f2edf525ba90ca966d97ea81c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153C2 17220 bytes

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