Malicious PDF — malware analysis report

Static analysis result for SHA-256 abff4bf111a0f6df…

MALICIOUS

PDF

106.4 KB Created: 2021-06-14 06:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 174c980df2bd2b15f07e924ff2a948f2 SHA-1: 3c32633c6677731a70baa0cabf9d152b83d04bef SHA-256: abff4bf111a0f6dfde0addceb7699b179face20af9d236c3f9d77c707bd87805
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=what+are+the+prime+numbers+from+1+to+50 PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ee7afd0c---74685025283.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a130f98ab9c63219873fb846ca041f8e/3712349563.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2aae01d7---8327722310.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022145488126.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/045cd4b0fc0d34273dc500e202e4b783/kobubagevivedo.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d435cece13---19883741912.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc5e11592---xoturofugomitezapopaf.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/suliwexego.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qd32np4hegij7vh4u90mut8p01/99956793697.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/sinesubefafokesarowowe.pdfIn PDF document text
    • http://allasclub.com/campannas/file/39884235081.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/86569443732.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jfkuu896n0k39jv717hkkr8h71/zutuku.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ccf5f20b4eb8ed30e487358788324a49/zakejuxufurukipesogifopad.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l72sl9eprpku676vb9no4q8sl9/1458002575.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mdfrlu6stp54sqjehsg20312fk/vewotufunulijuxix.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a175e9ebf87---74508359473.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 16296 bytes
SHA-256: d58c4639d1ebe79d9972e4a8067d9e042e0edab1f3eeee6069020a93a1a2f8d8
font_01_sfnt_off00014c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C97 5464 bytes
SHA-256: 8757b69a5b0234ea331f770c6203576e6041114a2ac858f1d25e6d864967b218
font_02_sfnt_off00015f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F13 14784 bytes
SHA-256: fac96afe5d95323874c45d716c6b8ca415c574ed807165db5e729c4bc639e2f4
font_03_sfnt_off00018d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D92 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f