Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c33e0218d13dd3…

MALICIOUS

PDF

101.1 KB Created: 2021-09-07 15:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a79e6cbc848b00411aec3f098f89d3a SHA-1: 51981bd6799e5975ba9a8a80fa2d357afdc4b672 SHA-256: 94c33e0218d13dd3a6133d444cba050460d24981a7c519a1f12d083b076aa262
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a likely attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160876fce8f026---zigatiroladewawivi.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160949001951b8---83827746589.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/diwuganevuzufovowesezo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vtb35t3app84aadadffsped9ra/9277741115.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/621c1a4602fd8b731d0f24cf9a947d7a/zalipudonomajokig.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/22962074400.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3b65986de0fed710943eb96445d2a98b/70487394355.pdfIn PDF document text
    • http://ge-mak.com/files/dogixa.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c6a0c39383a14d8d52dd790d968cd8bc/40480628075.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/putinivemogodivot.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608585bfb8bbd---bomoxefox.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/43158358009.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/59273132960.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/busunefoju.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/wagafewivotizagowa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6afb147a---99911179508.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/69568042770.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/97857422480.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/pokorosolafovudugogama.pdfIn PDF document text
    • http://www.pilartangguh.com/file/78814941971.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/11433846051.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/61246465556.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/385433cd7a1b1d2bff36dbe1f19868e3/30165821659.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/045b13b29b9623f639d63a9822e4e565/kalono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=right+to+freedom+of+speech+and+expression+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/4486134041.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_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 11168 bytes
SHA-256: e4a7c99435440fb15f99d16cd9d6f430d538caffb82d0ff45c7474c3e35d0962
font_02_sfnt_off00015715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15715 18292 bytes
SHA-256: d30bc14f02ee591262ee9b19094ba1d54cfc4ba3813713e919a842917fa83aa1