Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe8681ac91d8004…

MALICIOUS

PDF

81.0 KB Created: 2021-06-10 08:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4037eb6d6bc32d6730fefd5bbc13820e SHA-1: d38fc7cccdea8764c0c2e3cba888885153de2b39 SHA-256: 2fe8681ac91d80043eb9215ffa9c8974a1cd68260f08a55616f24929c666bbb1
156 Risk Score

Malware Insights

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

This PDF document contains a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=free+credits+life+selector PDF link annotation
    • http://tizianaiberti.it/userfiles/files/fedorixogupukinimez.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0464ee5129---romarixakevikorumamaz.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/32187248859.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/50782608118.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7013770f500fe400aea1a1f07099840b/zasaxuvoniluxobafumugox.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8daf10af69cd01e613b1f330b6f36aae/bekuratetolunepunokomib.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/530818958.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/42812447548.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/nclmno7hcr2iopfrs5s3d17dmp/44558710542.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0277371848f2c92ddf8a62aa63852239/kowamoxepu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/73776289539.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/42315963175.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/75r9416rc5asphdqk59jtq2tq5/seperi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/75865029307.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7cd7f965---97328954281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 4440 bytes
SHA-256: 4de08d57ba05acb4cd528c71aaf616b0f34c926f47c467ec748f194472187086
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 11064 bytes
SHA-256: 22ae815b6e2a2cdedad85007c45f04778c6f2b120dd8db625cf57b2a75e89275
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f