Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a52b1467ff0cc14…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 20:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 636070e01b43b35568e38e5660c4d104 SHA-1: 5e721dbf84c017577b12ba24f5c7fec801e9bed9 SHA-256: 1a52b1467ff0cc1431e9126feee014d543a3cd85f4552c90790fe84f01b3eb20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many hosted on compromised WordPress sites or disposable domains. These elements strongly suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=peace+of+mind+in+daily+life PDF link annotation
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/dameka.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/31050278327.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/benepajoxadig.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/27543566276.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/52329793284.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2stdht6eevl3mt0p9vgbca8cg1/mapel.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c2f25bee04fa6247d5437e2e6b055673/tivelujumovu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dhb7s9l91n2hep87apppnbif65/46697752979.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ee73b15f2690aabba04d1605f41e3c4f/95418032258.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/24047132347.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/9603333655.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/kinudawavujekod.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gofenoj.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/h20tnqdghpq1i0o7cltsd0al5e/fagap.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7926eadff2387dc44edf6e41b3968d13/sujelamogaf.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/803a1a220bffd60ea7c189030632ce67/28935304830.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/silusamepabato.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba055128d---gevexezotazoravi.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/1747505374.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/puxugagevuxamexaba.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n5fm4g45voffut184ecc2ckct4/70616823708.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/jojegobiguviv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 18188 bytes
SHA-256: a31e38c17e8aede181f01f5a5a02b468b1aecc2a93aee638cec4eb7463df32f4
font_01_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 10388 bytes
SHA-256: bfcfff460305180cbfc41d260fc9b883e52683cea41fc1a5eb81d56dd390db68
font_02_sfnt_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1