Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34a98122a0db47f…

MALICIOUS

PDF

99.4 KB Created: 2021-06-25 13:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 381a69baf2c555330410edfb845b112f SHA-1: 483745cee59b15c4961cd9e659aedbfa8f28ca36 SHA-256: a34a98122a0db47f7eb8bcbb096aee7dc5e0bcc88857035dba3722854adcd705
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the links point towards an attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=imo+clone+apk+download
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbae8d6356---88150042405.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096938487714---lajosakutonim.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/572ae7d6e2eb36a65bc873c2798eca88/80815689757.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ee56857d5---jarawaxubatodirotuxererox.pdf
    • https://balajitutorial.com/admin/userfiles/file/nagejiduzoranojikixutigun.pdf
    • http://travelshops.pl/userfiles/file/wafepeduruken.pdf
    • http://ohappy.org/userData/board/file/28641243933.pdf
    • http://ascensionchina.com/userfiles/file/23948976911.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/o2e9q2bek14g6gp1bfsqs59n8o/tomufofawadevujupamak.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa60ced5b0---xoxaxetowuganeriredelanit.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd3d8915e---mavinirefurotujolaxon.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd13869bcdb---tejobatimulu.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5801b0d4d398c245879cccc1017c7e63/xetiwililubugo.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/efv2f8fq0ddd0k84upqngvc2j2/49595661821.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a369987ef8c---befizupupefekisevalete.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010203.bin
708c5ccfc7bbeb0eacb2dfe2eb2f8f5b7fea751bebd6148fe9ae9e33a1fe8167
pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10348 bytes
font_01_sfnt_off00011957.bin
b13885d518091743c9606cb5596423475df729224489e78ce7b2b89cfdf4c27b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 16392 bytes
font_02_sfnt_off00012fdd.bin
303d82e36e3e431d65c3809c5968d8ec658b57c720a2f8f749b1e0d296860e0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 18236 bytes
font_03_sfnt_off0001600d.bin
72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1600D 1684 bytes
font_04_sfnt_off00016814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16814 16792 bytes