Malicious PDF — malware analysis report

Static analysis result for SHA-256 835283e7be2c1e12…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 16:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad05cc46e816dab93455c44013da5d90 SHA-1: 840cacfb678739b0a8b7a4b2599ac8c3f5ed8dde SHA-256: 835283e7be2c1e12bc03fd1f1a2257c81161c1750c0142708ba8e3f1f0af506a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware delivery attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=products+of+animal+cell+culture+pdf PDF link annotation
    • http://thepokeluau.com/uploads/files/bezejugebevinivibuso.pdfIn PDF document text
    • http://ducnhua.com/upload/files/50203493642.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/xasef.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b05716a697e---26288686291.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/radazotovidujixiwekawen.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/21353a5330eb0c19b084eb36d7600ce1/88962049589.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aced1b355f5---zepapi.pdfIn PDF document text
    • https://reniuved.it/file/22272271310.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a39c9796ea089a3c27cff1a73e25daee/49579488256.pdfIn PDF document text
    • https://scalper.ir/data/files/file/diroxukanola.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/53011052891.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821da94c46b---53381572027.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca11c8c686---lujaxusako.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/4379940804.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/kokivunitipadolebogaluzu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b8c88f7a---voduxujuzofogek.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb76d561f6a---wezaxoxefofil.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d43a0915121---55473677895.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bc084f4a---40036188750.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e479f28e1d---vekogifufigegodapad.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714070027219.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/96016673391.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/2526566859.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/nabigekatezavobume.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210813_927D25D30DAFF203.pdfIn PDF document text
    • https://arerp.kr/data/file///botodutubekajubetiv.pdfIn PDF document text
    • 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 10884 bytes
SHA-256: 736cf92cb98aa6a13059b0468314773b6a998814a09051fe43feb9cb4a8c8a31
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 17140 bytes
SHA-256: 9cfb96728c8c8b053bcb72be36cedc7a2e673d82241e1cac62c5c69cb8ead2dc

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