Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08c5d83186b5468…

MALICIOUS

PDF

76.9 KB Created: 2021-08-21 03:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e41015cf139987c1afed6bc296b1cf8d SHA-1: a5e4634c2c854492e49b004de7653533881eaead SHA-256: f08c5d83186b5468ac3a23946423dfa9c6e3f066cfae6cd74e0d8d35a13ddb4e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://afayl.com/userfiles/file/bixujuzumaputo.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f66c5ba38---35243102475.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bc79b74da92572890614acde35117a1b/fujelobewuzarexipu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/79852799704.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/96083918272.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/17496579132.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ap9a8t9v0v7m93u9om7gh26g3/fuzuvozikekogobegaru.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/wejosajowazulexarumegu.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/78028897262.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa8d4808---58747549483.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/53983a0ad63f7efdd02803dad94651ee/damefumumiwawinotewusopu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/22218557813e6df1fedec500d8419a90/lozogujakoniwufonub.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf08f5c89e---kesuboxufak.pdfIn PDF document text
    • http://honda-vo.com/upload/file/12267030374.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e484bc18b1---xonixufewugob.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vuxanasudufexagezodi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fowinoledolej.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/116d30aaa1d0a9742400b4681532a14a/reratagotiziwo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3600c0c90---figotopudetisogor.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/wilagamaxofelijeroni.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/bitologenimagebubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bhakti+gana+dj+2019+ka+videoPDF 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_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 16348 bytes
SHA-256: b21aae86ef6a2751f33d9cde33693a4bab634dbbd49207a473c0ff3653c40119
font_02_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 11016 bytes
SHA-256: 0f9bc23cf9a031bd0685b71366bb157e41b17146a790f3ddc60a7fe3e58fe115

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