Malicious PDF — malware analysis report

Static analysis result for SHA-256 16762b39044db5cd…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e00cb387de27d21008a5dbe47cc5f8a SHA-1: 17027c8c11d08f93ec3f863cb11abae02fa10bb1 SHA-256: 16762b39044db5cd3070f8e3cf109c0a97ef354cd1a8c5f95eabb88aa2c44d66
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a lure for users to download a secondary payload. The presence of multiple distinct hosts and a high number of links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f6f87dd79aa22afa2b93acbfeb8a26d0/46413191079.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b137fd43---kefebenuwulumuleki.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ccba179af01---logipefubigimigagasijapi.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe41681799---duputitewo.pdf
    • http://utuin.net/files/fckeditor/file/98355372179.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c44cede54---3630844816.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e13204ee20a3c2621b23cb208c502fd/62641197290.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba7d22035---63728759643.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7a7d85977e0b9ecaa10e9b2ca174ae11/43475579107.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69def2e5c---66401454040.pdf
    • http://riskhedgetech.com/uploaded/file/90859927960d95d4591c77.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jsmrn8jbesl130bv3uejuhjmjs/gopifo.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec6aaf6de---jobumipakuxij.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6e37bd30a3f18f8a5489bbc3c309e7ae/4030310747.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d31f4eb749591d482d3c55938fd63380/59086158018.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80241f027---42272381155.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a76ae4033---22825727210.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf5d09248---25675843068.pdf
    • http://cafegreenwichvillage.com/uploads/files/biwewokipopa.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f4bec818---4282354224.pdf
    • http://studiofelician.com/userfiles/files/mezipuvaluwakolilux.pdf
    • http://airsoft1.ro/files/file/luturu.pdf
    • https://trimix.bg/UserFiles/File/bumufilowobujaleradagol.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ec7353dfc---gevinovavesikavogiras.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3882e0cdfa57d6b7e74716f72c922404/27861185070.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blank+page+to+write+on
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e613.bin
d843a71e48f33ea05f794e3b1612f46cb14cf9566df6d90a05b1bfc6b0438c70
pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 10488 bytes
font_01_sfnt_off0000fe15.bin
d5f28cc0847733a1a87de1e921aa017341285826127fe3ad1b5cc573f69d55df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 16952 bytes
font_02_sfnt_off00012a4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 16792 bytes