Malicious PDF — malware analysis report

Static analysis result for SHA-256 9914fabf3adf9b7d…

MALICIOUS

PDF

93.2 KB Created: 2021-09-04 09:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 954ceed28b759e43eca33b08d30f9765 SHA-1: a720667fe196f15d588eeefef0561fa91f4a3cc3 SHA-256: 9914fabf3adf9b7ddc9805c60d42208cde6f71a7c2fb50c9274fe5be83739a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://coluer.ir/documents/file/korikabenixelatevetimud.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/97590866617.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6be20a2ca2765edecdff879908c744da/wojoxaluketenonokenegud.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/96473668091.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/lefalepavimob.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sevavikimajalibavag.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/94911121990.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210730162766755432.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/midusuvuxif.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/18c62ca69ab32937095edf24a7626b48/91174842497.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/vukexakovof.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dg6e4o62bl7a83ptm9ktbbm0t6/lixar.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc593f91---wabijuxiwo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a4ade2943c37c2f8d7d498a3df3b0e93/91578156943.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jopulalizirajipusib.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fdf62ef624a7ee9265f6fb237365a685/42335337595.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nradag0rmcv1l0o9u8jphq0d73/bufona.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/rilafetawopof.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/817b63eeb9dfa112103a20d73748e4a2/95959163909.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4bff41b56cd72ef26943494236025b10/59194782782.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8e4cdf5a3d9150395050f83d1cdd2b4b/96737465254.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6570f74b28ea87721f4c1e5bfcac7287/zodixoza.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tadetuwe.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tigifikaguronibasov.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/kikugigimagoligijomekoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=elementary+fluid+dynamics+acheson+pdf+free+downloadPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/12043361515.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_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 11168 bytes
SHA-256: 625df3a4664b09fd206edc3737f565273e8c1f13e1412c8aad4d27af47d6f9fe
font_01_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 18876 bytes
SHA-256: 4beedcde218f93addcde18e99bd46353d371e9ce60f5671ec2f69a85a28e3520
font_02_sfnt_off00014edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1