Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f7fa4489dd83cc…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 01:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a037483bcaab06afd96d27d0b3c4d56 SHA-1: 53c7c280906d819a740dc32f9c45c20645eb4f29 SHA-256: 64f7fa4489dd83ccbc79508069c42cfbd46ca8108cf1cade455828832ab44fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29de133d0---94611383136.pdf
    • http://bright-mineral.com/uploadfile/file/2021060813112983.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/05f0876560d08508e941eaac7174b5a6/49348748803.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464ae46784---60065208373.pdf
    • http://qianxish.com/ckfind_image/files/59929561283.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b282dbc1004---koxixerolanam.pdf
    • http://abnicum.com/files/file/xivumeg.pdf
    • https://menlopark.com/wysiwygfiles/file/55829688605.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/8ecbbf341cc9a703a310d6fc27bb7430/57317348960.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8dbed996---39756629259.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ba2b0b6b24f89c853aa7b97b8fee5abf/3303002797.pdf
    • https://bda.ch/ckfinder/userfiles/files/vowatelugedibibowebevip.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dd7296d2---vugikeni.pdf
    • http://auto-spec.ca/fck/file/7558748619.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/4151416553.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5d0a34e01dda4d1f4278ac5610dcc0b2/84691760931.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092abcf3ff85---fojopesulab.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607092c66665a---10677016516.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160914e0ee3d36---duzejatowem.pdf
    • https://tyeetomsfishing.com/userfiles/file/58720559848.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h21lnto5asf026vrtrf2mjvc3m/tatumurinumigide.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d86c7eb31b7---41528767812.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2f61fce7---99084890656.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b8f08360---kudilixebipumajut.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379573e34c---lonenabubapoxiremolarowo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dat+2010+incoterms
    • 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_off0000ec7f.bin
3d3abd91b3b19fa7a628cfc7c9aac0ec7b794d1c6bef7c9a49af28ac97622ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 10640 bytes
font_01_sfnt_off000104fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16792 bytes
font_02_sfnt_off00011d10.bin
c81a7d4aafddaec47529c6d6c9179a3c5c575fa2eb53874c3f206819cf0c93db
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 19624 bytes