Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c32df3ae4fcf0f8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 20:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5e1add7a876331ddd9921709f43b664 SHA-1: fe6796fb03e3a97e2838cea976f61d86ccd8ee79 SHA-256: 0c32df3ae4fcf0f8573ce334f18b67a73fc7d79280f486b4ae52b2438cbbd527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://woykoff.hu/upload/file/votepajuxojemitudezugu.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/37534141566.pdf
    • http://foodzipo.com/uploads/userfiles/files/papagojow.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/tugilakejokikejofijiw.pdf
    • https://xn--psg-9lac.hu/files/files/37460001532.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161424e93be18b---fekob.pdf
    • https://ensegun2.com/ckfinder/userfiles/files/nupobudosivuwuw.pdf
    • http://skiflogistics.ru/userfiles/file/fegini.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/rabavagelagojirud.pdf
    • https://anandamsanyal.com/userfiles/file/84035237873.pdf
    • http://bige.vn/uploads/userfiles/file/tugugoxivawisi.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b98cc929---68815568342.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/75399328190.pdf
    • http://kite-surf.sk/files/75654668281.pdf
    • http://chiaranannini.com/userfiles/files/vilunowujozilovere.pdf
    • http://www.itidharamshala.in/images/uploads/files/57550958367.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/roxilewelogiwufokuwu.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904ce7af24---56435816456.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6nslfkvqg30266nvmo51fu85n0/mawidoselamawadiwem.pdf
    • https://matratva.in/userfiles/file/81096933426.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/malasobanuje.pdf
    • https://aviseco.ro/userfiles/file/4340076054.pdf
    • http://anhhieu.vn/hinhanh/file/revegufipawi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=add+linux+boot+entry+windows+10
    • 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_off0000d799.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 16792 bytes
font_01_sfnt_off0000efab.bin
93039bc6bf4b8205d39da8329ea6557b74eadf807099e0a9e63737cf09eefd2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 17592 bytes
font_02_sfnt_off00011cfc.bin
94013d9e6594707d11984dc0bde54d38547666bf492fe3dad5819a9ac2bfb771
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 10776 bytes