Malicious PDF — malware analysis report

Static analysis result for SHA-256 37be9a801f38244c…

MALICIOUS

PDF

84.6 KB Created: 2021-06-18 20:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 624b17c37da5a915f7303f70e2887b04 SHA-1: f802ed725b4f0d0ec4e05c1790b43ab14e6c87d2 SHA-256: 37be9a801f38244c7f3cd3b9b62c33820ae011627fedeb033d7d518ce1b2d3d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5041284d6362531b0b99ca69b02d9a5f/86094447471.pdf
    • http://nowator-zpu.pl/userfiles/file/lutakelek.pdf
    • https://amatnieks.com/pictures/image/98214042680.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/57447b8819636ab4fcff0e962153effe/28091739545.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210603_88102430F22DB70F.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6835ebeed93a1513b4528a4fcc7821be/79826375766.pdf
    • https://flardochform.se/userfiles/file/kajokusegugagi.pdf
    • https://ladangmimpi.com/contents//files/4957264719.pdf
    • http://assushop.com/userfiles/assushop.com/file/jemevenejuxofituja.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/tidisidabewisetisositexo.pdf
    • http://casier-a-bouteilles.fr/file/xeravikajukifonuka.pdf
    • https://aronabritcan.com/userfiles/file/65310001982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=empire+and+puzzles+calendar+july+2020
    • 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://scripts.sil.org/OFL
    • 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_off0000e7d6.bin
854332067b5f74683679578267441f2c7f3deb175ba5a3464eceaa1f6ece8a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 5676 bytes
font_01_sfnt_off0000fb1f.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 1800 bytes
font_02_sfnt_off000103af.bin
0bcb8a0178b64014e6f8f2c78c12adc5d4b04b5e90436e6832857ba26f92a917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 12112 bytes
font_03_sfnt_off00012d1a.bin
a9d664dd083a868404960094170b4d011463f7983a46d89461e17a2e15b458ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 16396 bytes

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