Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a6fbe3ea42b52e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 06:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4162027153dbf8d86b8312a0e970d8ab SHA-1: 20cdeb0d4570ed6bfded45c94ebb7f8c39b3b915 SHA-256: 15a6fbe3ea42b52e1fb1e1196e86a0cc42808572d1a16195dcbcc5c10c84ab4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable domains, likely to host malicious content or redirect users to phishing sites. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=hanuman+chalisa+pdf+download+odia
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a3abe0203---87909282199.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608557c048683---95556331608.pdf
    • http://groupkaishan.com/d/files/36837333732.pdf
    • https://strategieb2b.com/userfiles/file/15588334111.pdf
    • http://zuche0551.com/upload/file/70620333507.pdf
    • http://sys-svinding.dk/userfiles/file/vuwudodijabofitemibogiwe.pdf
    • https://dineflon.com//files/32552268410.pdf
    • http://industrialsupplies.pk/userfiles/files/sovelobepegak.pdf
    • https://hobbes-group.com/upload/files/70719347133.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hgd2omg22s12ot4t796dg7pl7b/moliwomusugajuwawat.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/zebowabajozixejefexoxunu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f484c96ba---30502950471.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f684241c1d5---vaxozamen.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160722536e1f55---jolimiwuxukufonumiru.pdf
    • https://aldurra.ly/images-editeur/img/file/83248474645.pdf
    • http://www.jindatunnel.com/up_files/file/xuparojoroxiximegojuvuwot.pdf
    • https://living-stone.lu/userfiles/files/gurujuleregujo.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bapuzepera.pdf
    • http://accessiblevehicleservices.com/userfiles/file/2203815146.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ef42c0b0---kumuwigudotebokufixalaf.pdf
    • http://velo.hu/UserFiles/file/vewekivasowemaso.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_off0000b6fd.bin
cbc2206790bef9c8a7b9677067166f71586935a1881fcec53c57d394e28fea71
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FD 17772 bytes
font_01_sfnt_off0000e42f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 16792 bytes
font_02_sfnt_off0000fc46.bin
0e412f36cf2d9c576f524b0ee22a748070086788eb2db348bbfad5fe83b37b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10732 bytes