Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf81158517dbe9a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 13:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e66b5bfa8e25fba23a16149572292f32 SHA-1: a95b3a2b9f79bd56b446167b88e9fa00b3ff7897 SHA-256: bcf81158517dbe9a96254c7a2d46385cbea39c3270f31980bc8ed009aa2a6525
156 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 functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, hence the inclusion of T1059.007. The primary goal appears to be directing users to external, potentially malicious sites.

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://asiavent.com/UserFiles/file///69111998820.pdf
    • http://fogathajtohirek.hu/fckfiles/file/86848202496.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c756a747e06---77761860858.pdf
    • http://watthaistuttgart.de/userfiles/file/54533945152.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765a4b0bf87---52479488574.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/xopuxonufitadelutezom.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/44a56b04268d060b661ef4e4eb71d30f/fagifirabowowofifuk.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/kowowexudakuzifipowisoda.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7cf9413338f8e3ca68f4443f61e2a4d0/58435176005.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ace502111---54150197461.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/40c0fcf7becf0ed54580dad5a887c6b1/jisowozejonexitone.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24e1902b7---10413303252.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bee385d91---sasaxulijelodatafamaz.pdf
    • https://powermailer.in/userfiles/file/15852752546.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hppa839iirjo2capjhhj1330pk/nejuvimu.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210610_CE2CB5FB2062C9F1.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wuliveposalarebulazux.pdf
    • http://viprealestatebrokers.com/userfiles/files/80166946502.pdf
    • http://easyreturn.store/userfiles/file/potetovuroxawibupi.pdf
    • http://plafondchauffant.fr//img/user/file/fajenozosodikesagotasefo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/55504852844.pdf
    • http://ashioke.com/images/library/File/fakobo.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/bujutojinifarepi.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gmpvlfrfe5h9orp0ab515m2mqp/47695949505.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+is+a+holmes+fanfiction
    • 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_off0000e775.bin
f65c71d36bf2be15bc534814ab9c32135d0c024dd5fd245bcecff412641ef436
pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 17420 bytes
font_01_sfnt_off000114cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 16792 bytes
font_02_sfnt_off00012ce3.bin
21be0c94c8d86fb8d6220745d04f55955a2f1536c5cee468b4681bb771f98ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 10852 bytes