Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec493e66898a84…

MALICIOUS

PDF

91.9 KB Created: 2021-07-25 22:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 51f1495974f56aa7b675d0babfa09159 SHA-1: d1de187dffc2e2f3694fb07e973133fe4d353a34 SHA-256: b3ec493e66898a84e6d7d085e3428e6488c04f8e9c9da8ecd30b15f33f11da5b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://olympusflights.com/files/files/13862891690.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kr59k9289gnbm2sdil52g35a7v/ruwufopubeki.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71035e671---45492685696.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1e1dd6df6bad8240c5747ad5b01347b/15599348545.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jalufefidanisafodumipesa.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082ded7cf8db---mominimijulovuro.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4mj2u0upbm038u9pl6uj52vh24/8328170702.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f72e7145---zukin.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/kukoxotixafok.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/manuril.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/9991490487.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/milupusawez.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/20684892836.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/56p4kjlug1v20t1jghcjppj7o1/tixovug.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/jifiriviboruvukajasakirus.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8721600530.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/38442423102.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/59792941577.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8270a1afc---vezuxusesekovuxibisidise.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/36931732903.pdfIn PDF document text
    • http://talleresjpg.es/img/file/boxukotusetesufejeg.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bf295e1b690f442293b6e453fb8a806c/gafajuvakebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=inhibidores+enzimaticos+irreversiblesPDF link annotation
    • 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_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 10852 bytes
SHA-256: 0837640895ed87293a3e8565f7583ec6e1a0a28bc40d19a2666b1c879569b672
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 19068 bytes
SHA-256: ea4f4daace800c6314ca73a131a00e4a3e198b01813f65a569fef77d8858572d