Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3955c2303e9ffe…

MALICIOUS

PDF

177.0 KB Created: 2021-06-30 01:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4748b322305bddb513d8f7233aeb8e54 SHA-1: 1931ff87a12ac8bccea4ad8cf6d3de67bcc2c09d SHA-256: 8a3955c2303e9ffee0f6059b75a2a7c15087fbe83e004c5aa1d1b24e7423403c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://allytemp.ru/uplcv?utm_term=god+gives+us+dominion PDF link annotation
    • https://gw21.ch/uploads/userfiles/file/delufurewalexubitejuze.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aj8f4sfg7thadhc3h0tnphdf2/jazuxujivivefopofuguzivi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/94865075821.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/24796624457.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/lm0s6chgnb9ticg4kd1i3ai2pl/xibulepigesofako.pdfIn PDF document text
    • http://poorclarescork.ie/images/jirizogoju.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aec213b7f23---56515792118.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33186610996.pdfIn PDF document text
    • http://nakatka.com/files/file/59396320947.pdfIn PDF document text
    • http://fotossc.pl/_files/file/76727989543.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8caef7e27f99eee8cf7137bc16c9595a/8423912466.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/567d7448a0ac122e886698b361a4e0a0/35301095606.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/kakuwawa.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3p0dtrdanuru2lljffr8gfttk7/mizulisoke.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc84c46ff5---fijakuzowuwaxuvuzin.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56520ba28---xuzojinuwodozixobupuguwo.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6081800d---fotetekatufatepuluvi.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/42913023634.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ue19eg9llcol22hcg92h68pt45/89639003801.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4efc1a5766---35445358731.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/8ce5fff0dad630230e317182aad490ce/32668480992.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3d6730d9---96027292082.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a5a760f746ae63c286dead1e8cde5edd/ramexadedesawu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/kelodov.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D7B 10388 bytes
SHA-256: f27939a07d0a457f4d0583f9d181d12bf742bc81a59b5f5f7c7bc395da65d99f
font_01_sfnt_off000244c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244C9 23340 bytes
SHA-256: 07caf6a200cda7a57eb2e753b62f628cf31d587fbf5842077d5e7dea173ff11e
font_02_sfnt_off00027f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00029713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29713 18332 bytes
SHA-256: 982088317ff6a0c30ea5b4ab0b75a11096141a140f1d789f59e4eb9e1f0602f5

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