Malicious PDF — malware analysis report

Static analysis result for SHA-256 641420be916b8ea2…

MALICIOUS

PDF

90.8 KB Created: 2021-09-07 01:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0081cc3e2040bae4d9df4ada24249440 SHA-1: 06e8d222806e67532dbd27d4a5f3c5de480808bc SHA-256: 641420be916b8ea2a0ab9cbfed7625d887caab21997bebd722a6beffc98bb72e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting users via these links. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=english+exercises+future+tenses+mixed+pdf PDF link annotation
    • https://hamasataccessories.com/userfiles/files/lemet.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed72fd1166---tesisibotawalenuwipu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qd86p4ieqnnveag9r121h01is4/44007707085.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/22597147952.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3b8cfk61m7v2ltacto9nruv3p5/beguvo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e42a2f64ea7aba2fd436b4812599ecab/96814575000.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c72f392f6---44443990822.pdfIn PDF document text
    • http://suaups.net/userfiles/file/sakeduk.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/66842628151.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d57cbab8---14174113008.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/18933767691.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/40036215087.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/12454687233.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/36073391382.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4f1e25dbc---kagirofoxedimodowete.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/44113088428.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/92746484365.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c9c14146c504e370e415fbdf649655b9/jowutepifavo.pdfIn PDF document text
    • https://vestol.bg/files/file/9951806603.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/98754013997.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/wuzojefufol.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/54129847149.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-10/20210610193132306119.pdfIn PDF document text
    • https://norservis.com/files/files/resepom.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/56994668414.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_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 10968 bytes
SHA-256: db5407f4a0ab87b2ea5db023e60a65755594bc54b0ed7578b63d3237fa08c23f
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 18940 bytes
SHA-256: 00d5b693ecf1f9a33f7124212aaa6be3ab1afe4f3f2a12281e310bdf26e2e686

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