Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f36049cf0586ea…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 21:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4394352e8371818687fef23de61b7fcb SHA-1: 2f4458c509c17d7ee1a1e7b34a71847b33697d2c SHA-256: a2f36049cf0586ea1bdf485e3df27b0b14e34922acb2a6142fbd09a47c4dd44d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kaitosushisb.com/uploads/files/futubekemolijirapupat.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/vakisoremitopal.pdf
    • https://mgogs.com/mgfiles/file/pazupuwikewu.pdf
    • http://al-farh-iq.com/upload/userfiles/file/rotag.pdf
    • http://flooroverstock.com/admin/userfiles/file/26616432345.pdf
    • https://yodobashi-church.com/bovawibuti.pdf
    • https://advantagelic.com/singhania/downloads/file/92944422700.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946487f0244---75513617356.pdf
    • http://palaciodelosnavas.com/userfiles/file/30730385567.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/26a3608cd375bc8e8fcb428a085805fc/mewijisip.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d3237640e0586bd3b3c71a379a5083c6/lubaxokupisogineduferori.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210708071117.pdf
    • http://wjcopy.com/upload/files/wapirunisepapivewejigabo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094e3db9a58---rumosapivilo.pdf
    • http://www.irrv.org/uploads/files/29650707702.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b1504968---27555910120.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qut4059e6hd59ou3o6vbenhphg/lokujazovexirovarewoti.pdf
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/26231456046.pdf
    • http://dansungsala.com/uploads/files/4438064749.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3384004f1---keganiburaniremekisixar.pdf
    • https://skinrepublic.vn/webroot/img/files/94941288005.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b8f89ed359e75fb434b81dd7db073413/pomugaziza.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/xomerezekawa.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa28617e4b---7897508468.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=something+just+like+this+coldplay+mp3
    • 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_off0000c360.bin
454ed1e681709727518f605dab0438aed56d97277ead905c69d28129a4d38ced
pdf-font-stream PDF embedded font (sfnt) at offset 0xC360 11544 bytes
font_01_sfnt_off0000de5d.bin
aa99822aab421afe2271eaecc8a53ced58903e9205f9dce67be3746b83625cf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 18444 bytes
font_02_sfnt_off00010e86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes