Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc198268598e2953…

MALICIOUS

PDF

150.9 KB Created: 2021-06-27 09:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03d11d9da80e2618a9853e3bdbb811f7 SHA-1: 4d4dce62ca98261adfd096d7d41899f16e0bb67e SHA-256: bc198268598e2953bfaf520c2e9de8b12741a09ce51c1f7540ac3350e0829886
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a72ee93e---80405491074.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/09f1a4f7f86321ab9378621fe8ef7ce9/biwewiliraket.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda5650526---94536314631.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fb61b4e6---72015690994.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b057538b5e3dbbf2341910c97d490ca8/74956855814.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1913b906a0---7929988738.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/vajaduduxojavez.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90d7c3083---keguvuwevolu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fvd21uto1044c6ug65jne5t683/ranulaxixadilojekaga.pdfIn PDF document text
    • http://araonline.hu/uploads/file/bakiluvizazef.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f36e996f52a6487a81b5de3be1703026/zojapiji.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/47275142621.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7ae72ae6---9661049575.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/89f5fc311d5acc173f29ec84795b6a1f/kalarobevemigodol.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f38a14d52---34553886746.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/538f5794ba8444fc15e503c287480368/65887629500.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a151a1822af---79858356551.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/32520043238.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vomij.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/61197920503.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160908514c5606---41064038476.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/baxikajetovoku.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/71949596030.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/70ef4274cb338d8b56e81df4dd820c35/26470416238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+first+manned+spacecraft+to+reach+the+moon+wasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B482 10888 bytes
SHA-256: df19e2e9a12f901bf98981a6a388f11107beb9f0601a5f73550fc2abc270b5bc
font_01_sfnt_off0001cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD94 14356 bytes
SHA-256: c4332c70a0206476a0518494077f64cbc8610cd4efd691dc95a13ff75d0c166a
font_02_sfnt_off0001faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAF3 22256 bytes
SHA-256: c19824ea3cd8bc00d288ff982c049e76ffa2bd18cfbca50eb13a24535180eea6
font_03_sfnt_off00023351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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