Malicious PDF — malware analysis report

Static analysis result for SHA-256 71edbd3469d04fe5…

MALICIOUS

PDF

98.3 KB Created: 2021-07-05 00:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1299c9dbce345f23e29ebe9e6658fcd5 SHA-1: 24aed921f3e6064f06a452ed1f5acc0605c707e6 SHA-256: 71edbd3469d04fe53ce02b14d0ed0196e176a9699fcda5c668b4e921647d8eed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de54a9836---nabunixuwirikilaw.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/97ab34c018d4d8454cc9f8e192b61f49/64684343279.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0581d2cc---92572216904.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f3e92cb0---9851597599.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/j0ciu47d85fib796jsnrovcfrn/92807774885.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086a11b257e0---sekisatogadibalutev.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/q2bq608e99jqenrkuo48cgp48q/43543447795.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976a79a559---bemumewe.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1449b7a52430f21c50bf7b2ec5df6f1d/90319902045.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/24834899840.pdf
    • https://braindevelopmentmaps.org/userfiles/files/9040491367.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ed810a97795defdebd3e0848e7a9676/rojadegefo.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hhturcssk7ko2bkvsnb13ubt6o/pamazukikixavom.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802a1b4c8e6---17423030392.pdf
    • https://dycmc.com/DATA/upload/files/202106292101026996.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772360a789b---zalakofuxopovemovemaxutad.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b66924a4ddd---jenigegogetaruz.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2c83a580---bibuxafidimorotakin.pdf
    • http://ambvetfanini.eu/userfiles/files/madatededawubaf.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kugegetigogokoxivu.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/7rjh0nrtepfavobrmkbm8ufm63/tewejakepixibeduko.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/63c932430295e081b5606999f24681ed/82319482837.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e53939b7---49198443656.pdf
    • https://guapa2.com/admin/fck/file/86198862773.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/tuwamumuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=different+types+of+chai
    • 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_off000108e6.bin
f54455b17912d4e51e6e87deadd61ccca5eeeec3faa76e4c77f8b9a71876d667
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 16472 bytes
font_01_sfnt_off00013383.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 16344 bytes
font_02_sfnt_off0001497d.bin
c3de1b1412493eb38f5e4ba3a4aa0941d892d81acc0e161b1f649d577d2c8e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 10648 bytes
font_03_sfnt_off000161e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161E4 16792 bytes