Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f1808a71a66a7…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 00:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f12efa32c15e2125c6e2c2747fcedd76 SHA-1: f1d33ee018365fcba9001b4248031be3cb3e7a53 SHA-256: 942f1808a71a66a7c3a3a9e4a9ca8970ddf5860432fc7108f3936bec46f2c352
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of these link farms suggests an attempt to distribute phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akapacha.com/userfiles/file/valodanop.pdf
    • https://angelsforwarriors.org/userfiles/files/buseva.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b8033acba68d142c2644f24462b15c0c/89179190799.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f7be420154a5b2152eaf0077d601191f/medusu.pdf
    • https://xn--nmqu14inmf.com/upload/files/85774408293.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0120a13a12---38989863997.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/xetudivixoj.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/32870898696.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709a7fbfa56---66510115847.pdf
    • http://www.biotanika.pl/upload/file/tisipozam.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759695c355c---69357308937.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccae3b8fb8---21900903001.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742d33c576---39271251647.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b1504564c290a00d5ac7688a812e18a9/maxodulenutekiveva.pdf
    • http://asfalon.com/__files/file/rejoda.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607246b1ed39f---zodajovugowoti.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/jidonolotatu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609abca27a2f3---virijufinufudidotadure.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ui9vu40mepp8bjk96h4vmplm0r/delusozigabaxipi.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c49ffebbccbba36236c6743f980f4a33/64332909288.pdf
    • http://nuestratierrapremios.com/campannas/file/94778097508.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/264df6864e45284becda7515e2f84237/8644978756.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607708c7718b8---90526450122.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/51573800704.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=neck+pain+after+headstand
    • 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_off0000f0eb.bin
02d352dc70d9ff233519be91040b2bd32d10b3ca28cec63e68aadc6dd740ba04
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16148 bytes
font_01_sfnt_off00011aac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 16792 bytes
font_02_sfnt_off000132c3.bin
84f177fc353a012b7fcd812dc386cab18e7b46c21106f0eaec85ae645148b8da
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C3 10620 bytes