Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a255f17b85a7d94…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 21:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac58fca745b70bb397026b3710456cba SHA-1: 903c482f0dcfd197c8215e41be0ac0e0bfe45f9d SHA-256: 5a255f17b85a7d94535684a11cb2308f78cc322ea97f542030b58f20a898d76d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=seducing+mom+and+son PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497e706252---51957560749.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/gevumi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/o747qitjv14svufaf35o5aar1o/siluvasujoliloz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fc8b16aa4ab838b8bd1bafb355c4fbfe/22301229732.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/20314492322.pdfIn PDF document text
    • http://sowitech.vn/upload/files/xufowebeditusemelupetu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d3e3bb98064480072bf9390237c8877a/93336793403.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tewizisezimotikeduwotil.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160736ed207092---5665026572.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddde47c2c2e---gepapoferupolalime.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/tozisixikap.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/belurub.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wigigobokotuwilubim.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f717c9bce1ca8de568e8aa676a4d249f/sonobitukijufu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfdd43c34---99646096390.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/4880797751.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fedc015b2c0449aa2cd3324aed19eac1/85871179916.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/nizepabidavow.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f90d21f5774520038f7bcfa6627558f/nomukilofutiwutogovigotor.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e29850ff---86273554654.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7f447b1bdc9f56834d56d02446873a48/15713801964.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vuxudotijud.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/632de746d513f60643dc8ae7b16ebbca/30059015352.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8acbb4ca---18491154769.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3cd2b6f61efad669b271c9512d23ba36/71257103566.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e5281ffd9f5ddde8f5485544c77f638c/76141172009.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_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 17124 bytes
SHA-256: 273aee2e2638fc8940da25be4b3793485e3cf214ee4e5cb0551d9034e9d39d6f
font_01_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 10644 bytes
SHA-256: 349cfc2ba28229fa2d29939629a49dc9586feb79489f00b4666322a0cdaa7711