Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c1860de5d07f83…

MALICIOUS

PDF

96.0 KB Created: 2021-07-05 00:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1bd446b94644b12f404178ce76a1220 SHA-1: fafc7a1103238cc7e09b51a3026c2f6717a4e58e SHA-256: 08c1860de5d07f831c425040e24f23eb3dffb91817380a75a047db6665c3d979
104 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or appear to be part of a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further content. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=best+duplicate+photo+remover PDF link annotation
    • http://asiavent.com/UserFiles/file///rurobumeleneponovibejo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6c61b7ba---69330923003.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1a9367fd---53563019604.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a831f4ac435---28858404087.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pisujujivitevugogin.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/83937683241.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/go5c4261f6du0fncahbdi16lpe/11957406905.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce4b80233---rewapozenuketagager.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/82257427056.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1059bd00218357587df77a965d7d7dd3/51370391093.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/82483775488.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210612142222.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/28d75f4a2dadd3e2078287270cf1efe8/rudakapofewufamelajop.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60c7595f---tafizumizakinozo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5908082c---26783029377.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1p6leg63o23t340jatncdp5u65/65411809023.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3067cd86---vuvaf.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512093409808774.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/60r58ho150130se9nqbtn4urkb/12153448601.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/cb0a5f285b4db20395d9792fe0838f95/38158439462.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b67336b2c---3674053294.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 17748 bytes
SHA-256: fd21b6e629feb867f18f9a16a08e4b1a0fea3bb0d1d68103463d93a738e27fcc
font_01_sfnt_off000141a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C0 10896 bytes
SHA-256: c7c0840d4a2905ecf366cfcf3992869a58692e2168386b238faec212343021bc

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