Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2790a4c82b4b07b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 18:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31cf3946f9848d7354373140092605d7 SHA-1: 4bdcd281a3ebc60eb8c8f48ddb0e08134a1e25e6 SHA-256: e2790a4c82b4b07b332406a077681a23d05337b63947cb8a67063e6e80b7b506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://awlights.com/wp-content/plugins/super-forms/uploads/php/files/73095a1b934ec114d324089e954a2010/mutebokazegepuduwujoxat.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/gumotefatuzeda.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210801_239be.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/37207667396.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/dokomup.pdfIn PDF document text
    • http://mylodge-naoshima.com/69655624977.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d4c9837e3---92024549059.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d9fc9be8---futexavos.pdfIn PDF document text
    • https://seikai.jp/free_images/files/raduxotilo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fijopuneduvej.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/jezuzewelopozugekupe.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/56318618987.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/34242879925.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2157ced4aef3d715425cc7126d1865b8/50494137478.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d99e8993c---weligizuzemol.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/62709127536.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7790d0506---kiwafinedenufedej.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa83772792---fevopepuxunobugelus.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/zoxoselepofexofe.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/nomufafemi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ft27th3jdf2bsjgpg36d0dgc95/50239822546.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/kinulavazexasosadewuratus.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bcccb5464a197656cc18c0821773e07e/lufos.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4698176a1---lubekadijev.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e47346cb163899ad41680f615190b794/mowevawik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solution+selling+michael+bosworth+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 18520 bytes
SHA-256: 30393bceea4b4966f4a02e0b1e139284aa8e885076a21e98fce367a92098112a
font_01_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 11468 bytes
SHA-256: 18172f5275a066185c3d60c0f6a14a18bc2fbb1507f17db678f8c429de4e4cc2
font_02_sfnt_off00012ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1