Malicious PDF — malware analysis report

Static analysis result for SHA-256 620c5383e4f9a6d2…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 22:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e794e0193aca577a92299ecaec8fc240 SHA-1: 8e7cf189a3ce8f7ec73078f46aa52d13aa786f28 SHA-256: 620c5383e4f9a6d2bfb6ce1e0cacd72553a1bacb3ec3ebb771d38b68701d412d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

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 http://www.advokat.com/app/webroot/img/fck/file/15867321260.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985ead5df---63131171736.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3c54f5d9---sanorobefapesafe.pdfIn PDF document text
    • https://cargotavio.ru/files/file/bufuneke.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/93f38c72771df49f7d634f70f6297d41/49948966039.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/13261957497.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8868367bb---tikobodokidapasajux.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/31693577918.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/22615808323.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b1b3d616---sugalejafarega.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e347fd5276---buxamufugukekumodide.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/58610438228.pdfIn PDF document text
    • https://lapiadinafelice.it/file/73447041135.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/ledonujanalo.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/20873911638.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/61264122834.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1786e0e4---zozejugetamisolokevezake.pdfIn PDF document text
    • https://rinducm1.com/contents//files/pufolonibomutefobira.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1ad4962afe70c0f0b5edcd2e6a51d24d/73722316940.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160916c7b6c106---56523340923.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce32959395---koseno.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3b71d8e3172c0b5464424a1129872062/53157468821.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/27234616055.pdfIn PDF document text
    • http://bienbao.org/uploads/files/26441210801.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/472b833242f159670d2c571c2651a825/nasegupuxipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=elements+of+report+writing+pptPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16476 bytes
SHA-256: 0f8c95627d860f3792c834bd6416a98091a416c5d317da58b7710eae32c5e5f3
font_01_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 10608 bytes
SHA-256: 9c0846288045439792321525fc1b1e43e13e2113aa965b64c0ec633285da7221

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