Malicious PDF — malware analysis report

Static analysis result for SHA-256 372a6907f266569d…

MALICIOUS

PDF

75.8 KB Created: 2021-07-01 09:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d82a4d90ed412cd3f8a7e72d54a2f2b SHA-1: 8ee026ff637c6420cedfd99e3ad5748813266e05 SHA-256: 372a6907f266569d8f39a351b705005b369b53077fc9d8073f80ab570d0ba356
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This pattern suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ec8a9c30---14932827530.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/c5ra6u4e1n4ludq2s1td4hbquc/zilepisuse.pdf
    • https://cncunse.com/d/files/gezipexikorabovasatosobu.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e2a5d2fauuan17rve27ioql4g0/61628866001.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fb52c6e4---lareju.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/acc5eb7510a84db3259844b6f7d24753/soxujabuduserelomivi.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66846a9f8b---45392302596.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2353c5060---koxagamutozajaxenozusir.pdf
    • https://damsindia.org/admin/uploads/file/bedezur.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bae9ea84---97951583072.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b809cf2a0efcb48831030b492294a34f/gaxarejomezatiziwivepe.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2618c735---pexigu.pdf
    • https://perfecthospital.net/FCKeditor/file/6306672501.pdf
    • http://bociany.sk/media/file/64523148385.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c6cec08c74958f4c8dc5c4b93f3b778d/80935201974.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/gojoravoloridotusamaso.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6tm2tqb4ff6gbqmhsptomloni7/57643863232.pdf
    • http://www.specemc.ru/upload/files/fewopenopubelow.pdf
    • http://edgecs.net/documents/20961276873.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d10ac8ca---nobesobojafuvorot.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3f69ca5344ffc04b40caca7846e932d1/43931343034.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/18364e3da4a976408d93bfb16462adc9/99273326170.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf3a8232f---bexogujulupa.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/13230f845656bbcf22598a48e2fac098/50089065840.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jocud0andeacat3naevtuvmas3/59404552478.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=heuristic+search+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c563.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16792 bytes
font_01_sfnt_off0000dd75.bin
7448ccafa711aa454edf94d6a22ccc48e9b6d2e1d8bff50ec7f52a078ff10896
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16952 bytes
font_02_sfnt_off000109d1.bin
2f3f7aeda5789e88094aff46c4f23246f122f1da552ade4cd9106869c2c4d798
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 10536 bytes