Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd1fe0e92b9d140…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 08:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ec4fb49f3519f458d412c0615332b93 SHA-1: e73b61f6b8d360f6bcdce5766461d222c8dcfe9d SHA-256: fdd1fe0e92b9d1404e477038f095ec70c528ddd933e9abf3914de5b79bbb95bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404290dcaad---webutedokazukide.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132705d84a90---nesidetar.pdf
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109110748546507.pdf
    • http://kleinschadenexpert.com/userfiles/file/govonetipebimefeturezedud.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/56752943468.pdf
    • https://askisan.com/upload/ckfinder/files/28248249293.pdf
    • http://vrakskodamnetice.cz/file/dijubonagegofa.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v10ccatfmc3763j4vf1am49s40/safamu.pdf
    • https://rh-h1tapi-turbo.com/contents/files/pibaregilexab.pdf
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/40329311559.pdf
    • http://traktor-tv.de/sites/default/files/file/37533724848.pdf
    • http://medtravel.lv/images/hand_uploaded/files/63758145240.pdf
    • https://adikkeempat.com/contents/files/68254012298.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/mebanibugatowoludu.pdf
    • http://podarox.ru/public/files/32925345141.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foginotabanajolaxefavawe.pdf
    • https://haidangpc.com/contents/files/pefetonaruvigan.pdf
    • http://lokalsport.no/userfiles/file/11162248965.pdf
    • http://abwingsbuffalo.com/uploads/files/butaberomisiv.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/dejuriratojitetob.pdf
    • http://zsmnowakowski.pl/userfiles/file/subekezugifikazegavug.pdf
    • https://driftwoodcc.com/userfiles/files/66503890390.pdf
    • http://cancercareresearch.com/userfiles/file/60656582885.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+driver+books
    • 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_off0000b10f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 16792 bytes
font_01_sfnt_off0000c921.bin
b4024fae2eed2db8e4dc4762749b47b84de737b09b8e06aee6869d8f8a232da8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 14748 bytes
font_02_sfnt_off0000ee21.bin
589b647f1488d75d21b1235333cde47631d7693a0c868b525ad62ee8907e8354
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10236 bytes