Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f99f37bc791c31…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 00:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 148c72de4e70c01820e798fcd21952fc SHA-1: b6d1751d52a9ea573a13271d73aa55b1059eb4e9 SHA-256: 64f99f37bc791c31f31210a2fc81a3e15c804286bb9c7cc00fd2db5a33276af5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS upload storage, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf1f047bd---18827992247.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f35c0ef4---69720158094.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/tivavuwobowamesapefugaj.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c3665288854c3e51ea0d1fadfed0e61/ruvolomizaga.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c2a408f71541a89f2a65c5039a40b7da/13736841550.pdf
    • https://alrukn.co/userfiles/files/27985351395.pdf
    • http://vita24h.com/uploads/userfiles/file/kixit.pdf
    • http://ventilatoryzlin.cz/images/file/24306509385.pdf
    • http://bogelaipigeon.com/upload/file/80380054658.pdf
    • http://allaboutdowney.com/userimages/gujemo.pdf
    • http://boldogelet.hu/media/varekawe.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e3965db9a---tumugiloxuxabajumobatora.pdf
    • http://bitite.lv/media/txt/122/file/11973005562.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947659bcb64---nujemorif.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/42c925e06210f327a8a11b2ba97b146e/loputekalefat.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35478231a---38095233656.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d28ab41bb---zoxajupifinisivazebiwase.pdf
    • http://haniltm.kr/upfiles/editor/files/bakabilo.pdf
    • http://www.moyekolodin.com/files/pededebiwapovapizidenagef.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb5f8f262b---dabiminititakufijakunob.pdf
    • https://liniagdanskzydowo.pl/files/rowomojalozejawe.pdf
    • https://summit-christian-academy.com/scauserfiles/files/79748187528.pdf
    • http://ducthoaudio.com/upload/files/59194011100.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1fb4b213d5050764c9d5cf80db194e15/xidipagegebexibuxujog.pdf
    • https://bawwabatrizq.com/userfiles/file/sexutugetetotunumifuwi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lol+ultimate+icons
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebec.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 1860 bytes
font_01_sfnt_off0000f49e.bin
c8a6ccd2ae24d447f4d4356918900edf6b1097bfc5d87d1c0eb3f89291330c7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 18012 bytes
font_02_sfnt_off0001225b.bin
c50ebc0072bcba09849210e91633f5c132252614648c6c7e638fea92e2c3be08
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 10348 bytes
font_03_sfnt_off000139b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 16792 bytes