Malicious PDF — malware analysis report

Static analysis result for SHA-256 c129c720d83b61bb…

MALICIOUS

PDF

84.8 KB Created: 2021-07-13 16:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64a89c0bbe1733f73086c1d494dfe778 SHA-1: 76fd588a7fc117ef7ee7da6350c19b9ccbe92ab5 SHA-256: c129c720d83b61bb37b76ea9156704dd3b2c07f080b93a022d6971d1cdd4061f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and points to compromised CMS upload storage, suggesting an attempt to lure users to external sites. While no scripts were directly extracted, the PDF structure and link farm nature strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://vetcarefoundation.org/userfiles/file/47688195247.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f049e8f5f2afcd40fa4fa669a092fd5a/47782410771.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5007e6146---tirexifasiwefizot.pdf
    • http://gamax-motor.cz/data/dokumenty/turazuzu.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rhuq8uhefcvbn4mmfve100g5mm/xipuvirokote.pdf
    • http://bettaletroom.com/file_media/file_image/file/87996104620.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a18be927f9e---titakufo.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ap4892ck8gp2fd200k6oc9j4uv/pitedokusofo.pdf
    • http://mosvag.ru/img/lib/file/17430778357.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/69422375548.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5798ad1b3392003e801ac3ff897155d9/fiviwa.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a728f3d43bf---dadupesijid.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cd8e9d938295df23ff1aabaabee45a19/feterisa.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/53795981048.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57b95c4e7---mumek.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609699b813cc8---46059550190.pdf
    • http://pincailight.com/zk/UploadFile/file/2021070115033073499.pdf
    • http://alpinedelhi.com/userfiles/files/gitoxijiwujizagetogijewa.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1824dab339---jinikopedabagulaxatodig.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a329074f81---sisajotoxa.pdf
    • http://phutungtdc.com/upload/files/nefas.pdf
    • https://nnt52.ru/userfiles/file/55146299451.pdf
    • http://esipro.fr/userfiles/file/58810062848.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8a5eed23---sojatafelugoxuzumesi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877401a7b04---87684147375.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=add+background+image+to+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_off0000e9ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 16792 bytes
font_01_sfnt_off00010204.bin
8748a3ac6f9984ade4f8cc5a4f820f847d8a942da33e103450c3bbcb4e2b73be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 11060 bytes
font_02_sfnt_off00011b65.bin
5c474e2688c61a5d5778a4d99b588e94fcdaa0b32eec3b1e2c0882d406962085
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 16476 bytes