Malicious PDF — malware analysis report

Static analysis result for SHA-256 324d97a7e1e06556…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 06:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4b371ea960f0c59a624c731c7813d3e SHA-1: eaf4c79a26e1a149d7e3feca867ed71c5a439d80 SHA-256: 324d97a7e1e0655678976399754e43d8dca4c9172e21118ce9b5896aa3a48b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=printable+budgeting+worksheets+for+adults PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/86315f9ea7f0720343dbf08fbc4a563d/gazerawixa.pdfIn PDF document text
    • https://0900107678.com/upload/file/mewitolozewizemeki.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/46414878895.pdfIn PDF document text
    • https://medtek.vn/storage/file/wimufok.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0cd8bb08077b0ecdfd3391609591a5/36041750549.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/12399764256.pdfIn PDF document text
    • http://turatabor.hu/media/dulusifowevabegekezes.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/bdf0ek5kbkrie2390anhmof6jn/80262152842.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841a13ae3a8---dopoxajumi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/da3680bc9808d921778939320b129c11/nuwexufoxofowuwuxumasuxu.pdfIn PDF document text
    • https://dm288.com/slicice/file/11147985744.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b43394d29a0---wakusip.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/56640606315.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/fumefitebubutikaludi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wedugen.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1k6go16uk1mknq0bfvhiupfpqt/zabozijarigegelowenisogib.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a0bce90f59b5cdb54fdbc34e49f047d4/gafepubafozukirakoxalav.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c5566bf4---755577714.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/84072609129.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/sozig.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a41c5558---67128550051.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/33750718044.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/dejofo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160816b31f20e1---mezej.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i7cev1lbup2ahcq4fuorqts0be/toroto.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4c6b4bc7513444519a55f5da6536701e/30621756737.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_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 11052 bytes
SHA-256: 869ab81b3e2c5c2ea81eba5c0904de033c71663a118a586ce74e5760e7e8ec36
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 15888 bytes
SHA-256: 49b7a9a6f043fa29a6d5060773a6f2c457cd695dc32fe2df95428f3c90edbe3e

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