Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc6be3f9d664a02…

MALICIOUS

PDF

109.6 KB Created: 2021-07-06 06:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c60960fd4ce0f8115cb4b6fbc2c215f5 SHA-1: 6acd0b6b5a0ace374ad95377fa0d4f0148345b8b SHA-256: ffc6be3f9d664a0242209aaa64264bfdbea06184b1b6d4aa0d30bac8ee4d7f94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ur5sdjmgiqss3uh62a8si9hc8p/89753043013.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14afe5a35.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7e46e18e579ab2e0a204f3e6e4085862/91526007258.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9d9597dceb5148821c57b18edd22600b/zotewegelagepabuvab.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840071d770---83082075590.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df589f7affc---98537624062.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2cefd3c2438f43ee8c1ca8130708e871/33802331491.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f3d8d18c5cd0db5f8c2a68ffdb19606c/penukijevelaxelogufa.pdf
    • http://amphorabeautyclub.com/campannas/file/64535831857.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073bfbe4ea44---bodegumax.pdf
    • https://pet-fashion.ro/mm/file/vifuxoxemamejejon.pdf
    • http://daieimotors.com/js/upload/files/51069944046.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hnj4bjlta00abjta6mudg4ki7c/faxarimudofapumuto.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160799ff199b51---35338018704.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e57c8cef---refedozilut.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9f5d60b3eea5ea22bd207eba3ede2570/gifipenikaganozezojarawe.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/98222843068.pdf
    • http://nontaromclinic.com/ckfinder/userfiles/files/bazegogesege.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bopd8bpgjp556eqj957oq0c480/40155863534.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b02f1d82945dab3e43d8d3be4b3900d1/99809791080.pdf
    • http://sztarmedia.hu/_user/file/12430923757.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/50547d50cbbc127d7dd235b65805482b/59298402766.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/dolowovegowuwev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=c%2B%2B+hotel+booking+system
    • 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_off0001487e.bin
d1c0a9819b0a372e704d80e706be86bf164560bf563c3495abf11fb1802cffb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1487E 10672 bytes
font_01_sfnt_off000160c3.bin
cea4d9071f3249faa2bc22b881c4703535349aaeca42bed07cc3d73d2b3a667a
pdf-font-stream PDF embedded font (sfnt) at offset 0x160C3 18028 bytes
font_02_sfnt_off00018fed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FED 16792 bytes