Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c620691b1b4c5c…

MALICIOUS

PDF

86.5 KB Created: 2021-08-21 09:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05162a0ece6779217a920bf8e5e1c5de SHA-1: 7de80b3584ed4efd9303703ef2a9027423e4c4c8 SHA-256: 01c620691b1b4c5c26f7a39514f17ac1f3877ed50a39d0ed19b577bf75592e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://erex.hu/upload/file/fokoxorizafopem.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/12497838493.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fuvof.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/44549198127.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/16037053288.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611d23a7d00e6---pufome.pdfIn PDF document text
    • http://apsons.eu/files/file/57329787389.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/zotapidofozibefeg.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/648db0c9831aa87e7acc80e77766bddf/rugemijoduga.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/nuragalebusinuxurako.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87d85b440---tanarumipuli.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5fc5d371---datolelumekefowirutuf.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/44465417665.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/furisideluvutomiferofuse.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0d026a36a---dalipusitenabojunu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/efa60310a95a95294509913d254ad502/1423540466.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e61c824c12bd2d03999aac81b2db6747/58494980149.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/xasesobol.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/038fdd64aa7a1b9166891a03d2452cdb/21738140357.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/88909293665.pdfIn PDF document text
    • https://lapakunited.com/contents//files/mumak.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3a7997301436e8cb1b4944da668a41b2/pokaduzepuxelawo.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/gesujesow.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1beb6623---temejimoto.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/32907542440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+season+36+blackstone+griddlePDF 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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 17536 bytes
SHA-256: 7e57551d4f614fb1af817c3f3516d186c22b26aae5d8907e79b14f637a30c2e0
font_01_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 11196 bytes
SHA-256: 9db07ab3556cef5a133fe685a6be5bb582b400c779626d77daf9fea41c8f6c94

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