Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8756f453449595…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 01:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fe6af7d8b5fa02f0df8b49ec210fdab SHA-1: 249aa60b0916bbb3f9490afeb6a3e6ffc8b42a7c SHA-256: 3f8756f453449595791a6281a587b694144eb78aefa69a5f73d5b4e626f880f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and potentially exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://a2designbg.com/userfiles/file/wupasevu.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f58003e6bb3010cc5febe03395e608ea/87981708264.pdfIn PDF document text
    • http://underbutter.cz/download/foto/nurodepotakadowobajag.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gepejixepilivezaxujuteku.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3d1153ed---zafan.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d325a55---83546620394.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/67656900517.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/90693869546.pdfIn PDF document text
    • https://cooperspick.com/files/10727700478.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/35028937408.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/wabetixatozike.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/80162757753.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf9705eea8---mipevamanumubipep.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/33032ed986c6443f8167f3ab50c1eb36/29834168835.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6409b74352bf96f98a241dc77da98dd1/kekaxatogob.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/60885917173.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/77801596197.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/dovitajoxu.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/85876255841.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/55588690985.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/017f16773361e3188b350d303c886f85/75481344382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=1st+grade+writing+activity+worksheetsPDF 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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16420 bytes
SHA-256: fc6395cf653d2b82ef8752ec88b5203e65e7a6c86d3cc014cd70a9b30ceada53
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 10916 bytes
SHA-256: 90e914c4f48ef9c53618b11fd4879fd9ff3c514d0ad3dd74ef70c8aab8dcb091

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