Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d4ac629685bad3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 264528da7c1648d9b48a8db1a64a90fc SHA-1: d51d3882069726c113e7556b38ff942d2c191cff SHA-256: 00d4ac629685bad3b08010b304d1bdd9f44ee9570a5f33f53415d46bb249a542
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple disposable domains and compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ww150005.linebot.net/upfile/files/20210916194919.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ca1d4a518440a02eb1567a803b7645b3/8127122396.pdf
    • http://parateam.cz/file/zojabejixa.pdf
    • http://acudrved.com/ckfinder/userfiles/files/7691889777.pdf
    • http://gusanhightec.com/userData/board/file/ragibokexojez.pdf
    • http://schokofontaenen.de/idata/3008082376.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/surinarabemuwaful.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/51770653296.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/9033679784.pdf
    • https://rireenfrance.com/images/upload/files/xukejesawixo.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5c47f52ef8f983f851732aadc7be284a/nakukexe.pdf
    • http://ingfrimale.com/userfiles/files/xekimoli.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/nokafawaxiwenatanis.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/14693015598.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/558484b5b6da777f9da0b2234cc8ea2e/regaku.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/furojoturevikor.pdf
    • http://lactopad.com/uploads/files/xobosodixunevupovob.pdf
    • http://aktifithalat.com/resimlerfiles/63370758769.pdf
    • https://aynispirit.nl/userfiles/file/leporesodinukosuzetubaje.pdf
    • https://limsurdua.com/contents/files/83688014853.pdf
    • https://turdv.ru/SITE/files/editor/file/73286688963.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/vefivujunenododefuru.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejedopo.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/divuvatitujima.pdf
    • http://4darchitecture.org/img/all/japuremoxaluvo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+put+a+cd+on+your+phone
    • 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_off0000b8de.bin
22ea0df0733a5d66368683cf298ddb4609059f4fe8cea25dff318c2d5218b417
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 15616 bytes
font_01_sfnt_off0000e0a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 16792 bytes
font_02_sfnt_off0000f8ba.bin
555a7000658bdd8df8047bc0247ad226c7e7e65c3f34c8a1a9580a85a2db9e93
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10596 bytes