Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd791a33db02395b…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 12:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c993cc531deb37f7c6977aabe21b340 SHA-1: 3a29ca2f6340fcc3cd72bf7a6f86e0a8f57ab363 SHA-256: bd791a33db02395b7fd39de35906d11bb5db4867e9613074f7a3b83f87e6771e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI findings and the compromised CMS upload link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9nr9889b3ib24jd7g1q1el3f67/ponokezefurodomojo.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3e813ef7328d31f678c6a3cf97e73b93/66345358438.pdf
    • http://i-daa-wl.de/userfiles/pebiger.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc391b3f554---11421335709.pdf
    • http://amon-syotengai.com/userfiles/file/56150516530.pdf
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/62266762520.pdf
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/53217465560.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160701ee738b76---xiwojudepuruduli.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c7904422542---sidukawubawaxixob.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/964eb9ce0137e7279efeb2bad47736b2/53847468680.pdf
    • http://sva-jeanroze.com/xmedia/file/nabovanamalubumugogijese.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210627131521.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160995fa7c8297---gijeranotefuwosux.pdf
    • https://carrieres-pierre.com/userfiles/file/42589297489.pdf
    • https://digireg.nz/upload/49328824148.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/59b32a8eeb416df8f4258510d66206d4/88948083605.pdf
    • http://universe-micro.com/upload/files/20210629_003718.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/eb5f54467c0b02b7add061e6b57ebadc/ludodolov.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d42a0266---61842805897.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f280a5ef5e6e9d69b8305e810e8163e0/9646367289.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/coe33vrb2hvqqn3sbdgjm3guvt/12648150810.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pl3tnoliv40ij4nchcrdv8eejr/57605766713.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/perexanisebajaka.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c565ce0d021---niremivojafil.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe91dbab2d---tizorefigenidarejanubavi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=single+game+parlay
    • 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_off00010fbb.bin
6809ad1dce10923cedd52b1d70166167df5e71eb5f570f0af05d758973c7d07b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 10396 bytes
font_01_sfnt_off0001272a.bin
e073651a436c1c892623b0be35b70e71b3f2d62dcc30b1d107efcf27a5ee664d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 16880 bytes
font_02_sfnt_off000152e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152E9 16792 bytes