Malicious PDF — malware analysis report

Static analysis result for SHA-256 495471cabf957881…

MALICIOUS

PDF

100.0 KB Created: 2021-09-01 11:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4a5e9d1a4e4eca5f535e8b188564eda SHA-1: 59f10a51184c889d0739f54d6e112fe212428ba1 SHA-256: 495471cabf95788137c4d11a015e4c8459140f99e0a5dde6424430565998d67b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://garglob.ru/uplcv?utm_term=adele+red+hair PDF link annotation
    • http://yoga-privates.com/yoga-privates/file/wufaxoronasuratotinoz.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608111a4de94a---32605436171.pdfIn PDF document text
    • http://surtek.biz/image/files/20150208_014105.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/11825007552.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070cedac6f81---71219693367.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1f59ba3edd15b0ffeecee6a4bbd75a1/71767782674.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff469326856---ragijus.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c7980996794---58097960348.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608861dd46aaa---metiwosajofov.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gabapawad.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b361b12fc53---jivukixoludurutoman.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/44368395386.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/tusilawogutijesoka.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2megndsjal7llrb69u6sisdfc9/tazenor.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/995b30675dd2c0675858b9e00f5f3260/tenimuf.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/641223555438efb5abb2db31d52690c4/kekex.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/luvedapagede.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/luveramudumop.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608445c8ab043---dosimumizoz.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/43f3c1e721beeb811d929951bf0dc3ce/ruragexiwotidaki.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/57902853635.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 9836 bytes
SHA-256: 3d0b9072c29fb1f804ea3759a2dcc71c5e7b7155d530d47ee9167e4355b604c3
font_01_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 20076 bytes
SHA-256: 142151989e4afbc97d708b1ab814f0e278dd2fb3045c098d8c2114ad933e043d
font_02_sfnt_off00016988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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