Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6acb0e8da7d0c89…

MALICIOUS

PDF

142.7 KB Created: 2021-06-25 23:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f19c806f2f5f6481a2e77a5109dbd730 SHA-1: 369660bc3ea2616f3c6df87bbf2171f5d3c5d8fa SHA-256: c6acb0e8da7d0c899d01d1deb2a22585304786ad73d7dc8034c2057b2851d5b7
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it contains a link farm and impersonates the Amazon brand, with the call-to-action link hosted on a non-Amazon domain. While no scripts were explicitly extracted, the presence of embedded URLs and the phishing lure suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://laborke.ru/uplcv?utm_term=the+100+book+michael+hart.
  • 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://laborke.ru/uplcv?utm_term=the+100+book+michael+hart PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fdb6e322532e94ad197f398aa1134085/66890025094.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/l16dogm3pknudtufvn3s4bejpi/bidodagawapaw.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xagasigenonumomorupup.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1584349dd---konafibijosiliju.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096064a6eb84---nofigun.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c29216d5594---91677990332.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ec3301a24cb794c330f56d5553a6ab29/votekotategowufudujudafi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/61889800959.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/07622239bf17f004ddb5b19851c8ae53/kasejoxaviwari.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ced462b11---30753870467.pdfIn PDF document text
    • https://ksboutlet.com/file/files/67471298118.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee3b9e803---80337705954.pdfIn PDF document text
    • http://iphysiology.ru/upload/gokokip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d31484918---30374249307.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75b277dc---rofulug.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3919eefb92---42641231179.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/37409406099.pdfIn PDF document text
    • http://bociany.sk/media/file/37112048437.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/34701922299.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/d4schqad95jgakcvmctf876emr/rujasimaparurapuwafom.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd16516d4---82859129457.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mudenaxapezinasada.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d67e4d62---99346525006.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/16f141923a7705b6fab3508abaeb414e/lebixuvubamonox.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_off0001c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F0 19568 bytes
SHA-256: b4e4dcd3494e37c7af69abb2508d4d9fa012067ab4253a65204cc60611de7ead
font_01_sfnt_off0001f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5B6 10592 bytes
SHA-256: 2a0ea23b24044ad8e6728d0750631778afa97e3cdbaf35f637b60207fae1e6be
font_02_sfnt_off00020de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000225f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225F4 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500

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