Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc57b8c8bc8e074…

MALICIOUS

PDF

99.6 KB Created: 2021-07-24 16:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 686e43fcee37dec8a756d80639e5d977 SHA-1: 8175409c7341c698b47c26a04896a5f0b7e9adf0 SHA-256: ecc57b8c8bc8e07460fdc7d4f89a6861f850f34ad2a11d6b3df31d79384b98e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://atraba-holding.com/userfiles/file/60969391708.pdf
    • https://lexcyberia.com/userfiles/files/56463969086.pdf
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/79668666426.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d370439e---30963348786.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c6f3514d6---96176448809.pdf
    • http://korean-school.hu/hangul/userfiles/file/37589735047.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p4ndab2ggtt1octhm3550bf6k1/sadabomapiso.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/50772194070.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608467a19d5e6---wolijurenofaleraletekawi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gank67lkbkvfiji20mde12e6gi/nabesukiw.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7b8aa51b0a36be091c3731980fb2a99d/42449659109.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d07bced6---kutogifovutisizesujofud.pdf
    • https://quangcaowebsite.vn/uploads/files/57216227510.pdf
    • https://focaccellini.it/file/jasetilom.pdf
    • https://riolospettacoli.it/filesUploads/file/fudoxovoletutimapano.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087703bbe427---11059671018.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acee928e84---31590345149.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5516b87deb---wexifemawogelugopesani.pdf
    • http://heyumpnd.com/userfiles/file///regovumamapolobebizef.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/070f0fd4c5c2a01a7209587be9bff3e1/8808442078.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0c4cf688da70e8749e5f01c50302db19/kebutumikezigumixewin.pdf
    • http://chapelguild.com/images/usr/xinebesudebip.pdf
    • https://khonggiansachhanoi.vn/uploads/files/52367582622.pdf
    • http://automsystem.com/UploadFile/file/20210507131137387.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=soccer+heads+uefa+champions+league+unblocked
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5886cfa453c9aa602b9c9d9da79d9de0/rodazufuzilebenejiwul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013d0b.bin
fd70c5381cdf7b4df86d329976aca8a22ce7eb1064762e13aec22ff954be1f98
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D0B 22532 bytes
font_00_sfnt_off0000f88e.bin
15ae4b1d1017b557b75f218b46d4d9a0ab3909399b553b5b5055abdc02fb2683
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 16552 bytes
font_01_sfnt_off000122f3.bin
0fd4efcd50fcc9926a2620a7e0bce49ac49038ee3218f86e212538c16e8e003a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 11376 bytes
font_03_sfnt_off00016496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16496 16792 bytes