Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a138e45822ac0ca…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 12:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff6a09e0c51ff929e09e008e2c3c3686 SHA-1: ef58054d294e4c93da872fdf034e357180ac05fd SHA-256: 8a138e45822ac0ca017f8be9394fbfd99b407bf184a80a4bcafb9b1006b7843f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=bolsa+de+valores+concepto+pdf
    • http://adamslakeband.org/userfiles/file/fuwupujufozilabitevar.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558f2a3339---gowijezubolifikum.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d459dbe---nolepananubez.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e61eaf4f04af6163fffebaac95913ad6/tipisemobemajudamibit.pdf
    • http://smepil.com/ckeditor/userfiles/files/65298806919.pdf
    • https://marsanz.pl/uploads/fck/file/42370874330.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/57365413919.pdf
    • https://ph789.com/pinhsuan/files/file/madabopapapibijunar.pdf
    • http://888spirits.com/userfiles/file/pirewiwibiwuz.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607794f862f41---vatuxinedeluvogejimilagis.pdf
    • https://avigailpekelman.com/sites/default/files/file/gogubatizobub.pdf
    • http://alltechsro.cz/files/nemusovujepetudutomo.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cff45cf5c---zixitegafamafuxab.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9845b8f24---posavilipiwume.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d097df11df---tajoj.pdf
    • https://allcreaturesinc.com/files/files/87026481441.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/694kgo02j0stnq0htrnbaj1jgs/87533265198.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5bca153efc142b68f11115fa4765043b/54167088622.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef86bcca48---koxiwigogozumomi.pdf
    • https://didacostruzioni.it/userfiles/file/wapetekepevuwerenitadi.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/99239251570.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0bnm50a4q06pffmhicv11vqmc5/77182457972.pdf
    • 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_off0000eeab.bin
71aefc6cccef9b042d454c304e11961bf83e6dbe2adc0556a438af95f55732fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 18436 bytes
font_01_sfnt_off00011cd1.bin
736ac14e6765b7a7d665fc334b6d53a42613bbd39c4740ce28e6dbcfd7431edb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10640 bytes
font_02_sfnt_off00013567.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 16792 bytes