Malicious PDF — malware analysis report

Static analysis result for SHA-256 602125777e64565d…

MALICIOUS

PDF

86.1 KB Created: 2021-10-04 11:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9f9a6f3481092c042fa848f6117d0a45 SHA-1: 908db41ba7ddacc0b02b858be386159acf7033b7 SHA-256: 602125777e64565da4e7e35b0c86416173148db451ed1e12a51c200a482114f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://food-cloud.com/home/food-cloud/www/site/site/data/files/32680594700.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144be5ca62fc---tefixog.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2043b7f61---68925587359.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/91453785204.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/16243264873.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/jadowatokiposeti.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/46960514625.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/depudovibem.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gagofifuju.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16156df096f02d---rakidivemejufusigafapabu.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/65908469559.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903031738.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/godadagewiwilagiwozani.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/49288538033.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/forijabusekitanem.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca0ca98c5---xoral.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20211003_170450.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/nowumodut.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/puxojujejazose.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/lotonolefukagovuxe.pdfIn PDF document text
    • http://silver1979.com/upload/file/domorarogizidigorapij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=triangle+within+a+triangle+symbolPDF 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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10860 bytes
SHA-256: 8f0b6e9496ca60fb5eae7e0ebca3ae02d0cdba8f493cb7539ef1351aaec76434
font_02_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 19116 bytes
SHA-256: a02d34bf4d3bb736cba91565b7ad131eb02a9dc41d68a3fbead402ae72146276