Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c6cb23c1d7c46c…

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 22:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e90e04e281340395f11152b487af9964 SHA-1: 277bef502256f6aaf1782a7cd6ebe4fb3c8cd8ba SHA-256: 22c6cb23c1d7c46cadb0c7579b787b0c1fabe8ad43da41f096fb727d039da1dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. No scripts were extracted, but the structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://volnynaklad.cz/data/file/pimome.pdf
    • http://alkanboya.com/files/file///82550017502.pdf
    • http://mg001.cn/upload_fck/file/2021-5-22/20210522040348927686.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f61cd0403a---rojudufa.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf850c2e8---25303113509.pdf
    • http://naturallabs.de/userfiles/file/pebarexa.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0a03321a---zowisirudemutanapavavusu.pdf
    • http://axiomestates.com/userfiles/file/63782594646.pdf
    • http://apvn.info/userfiles/file/nibubow.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7a633669---bepisobegidukuwovuremujon.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa8b4ce3a---tovibivomavuwodinodanej.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607364d9646aa---23406388133.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4822d1e3a6052221a4f2a04d11d37823/kojopupixe.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/savobozeka.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b6aef803c10bbea61e97c0b7600bd0c0/lutabakosunurosugolepu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c9659deb2---zagepakokizurap.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cddfa81f2---dewusojipewamutimifo.pdf
    • https://diphong.com/uploads/jifakonosaxovukij.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5cca74e46---61700435220.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/cf7pv3v4iou0vsq99ebs2pktpn/36279416158.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7aaef367---kaniketativu.pdf
    • http://praconsulgroup.ru/pict/file/22020855071.pdf
    • https://ikitellirezistans.com/upload/files/23295660708.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+it+mean+to+be+evil
    • 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_off0000f879.bin
1da9caaf6d75fb17e877176ae68cf2de1942f51faaa6dfd81a37d26d976441e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 18184 bytes
font_01_sfnt_off00012817.bin
25c0f168c6954999e9e38e93404b78c2b446a9543743741c4c5aeef68cedad28
pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 10612 bytes
font_02_sfnt_off0001402b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 16792 bytes