Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6f1f1aa1c82096…

MALICIOUS

PDF

88.0 KB Created: 2021-07-16 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 442880f890db6a93ee0b23b9b6ad25ec SHA-1: 5fc0b1c0d6d4035904546f89165a1fc91a38e178 SHA-256: 9c6f1f1aa1c82096c39d260b72473827f6f39b8c3202612247b83ba715f71433
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of multiple compromised upload links and the use of UTM parameters in some URLs further support this phishing and distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b6cd0eb11---76062022689.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rofoweteb.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tugelg8fnmuinimd4a154a3h3q/94928741556.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cc6ouvq52qp9op48e09ho7lfv1/38818653702.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca1c61e2d---61068691823.pdf
    • http://hnc2.com/userfiles/file/14006643712.pdf
    • https://astefin.ro/ckfinder/userfiles/files/93012797445.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/49a2e7abe09818cd86aef822ee45becd/wuxolodo.pdf
    • http://dailitara.lt/bites/uploads/file/81113853530.pdf
    • https://anukulagrotech.com/userfiles/file/nofivuvabikironajop.pdf
    • http://ztkammer.at/uploads/file/sodepikebo.pdf
    • http://strategie-online.net/catalogue_dynamique/file/94981238487.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160766c4138efb---firosixivu.pdf
    • http://rurisnet.org/images/file/gojin.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/29773129508.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a6923ae96a411bbd7565f5afbe605768/mepifiwinowarasugovupu.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/repowovamujusurud.pdf
    • http://riskhedgetech.com/uploaded/file/58263962760b05f75f2c7f.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed40ad72572---69996346254.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8617349f1869ff5515c68b3bb290aaba/pifotuneduw.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/dubabijesujirivuw.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25efb8ac0b---degufirifudi.pdf
    • https://alsultantrading.ae/userfiles/files/reguwexibawuk.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eaa30c3d1---22706398537.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+weeknd+beauty+behind+the+madness+full+album
    • 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_off0000f50a.bin
a6818833bf5c99969ef235cdf944509855ca8f882cd862d6f8427a093b270825
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10892 bytes
font_01_sfnt_off00010e24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 16792 bytes
font_02_sfnt_off00012636.bin
72ff6d41f60a73035c4293a8ef83c0dd94cfdf024cc4df0043fff1f2d2448b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 17268 bytes