Malicious PDF — malware analysis report

Static analysis result for SHA-256 df341940be9d6543…

MALICIOUS

PDF

86.8 KB Created: 2021-08-19 11:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ded533d1659e2a5b389763044b54bb0c SHA-1: 13aa4c9ab200d9fb518faaa255e12f75b928a028 SHA-256: df341940be9d6543197fdaa37fa20c95ead4c69c67e6f30b2d137c470aed609f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://zzwgjx.com/d/files/46298493061.pdf In PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/876be87a99e308bf2c7338dd51bbe59b/69268593665.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/loxazojajiwomowena.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/acq4u41nuo0mhq4b0dfp8730sh/28596935691.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1a4fc8a2aab0e3549ab63a882666cb3d/difotufiku.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/772805uttqd8qq6j1leovkatlh/lazanusirinorawalofarizi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1b2b5f49823458833b52707affb0acfb/75761104214.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbea8db1676---53066597032.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/93252699991.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/pajltuu5c968e4eckr6pgotrt3/54127020873.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa572935351---wolinat.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/sabolako.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/vegamexuraledirusozanefe.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c1328a59d0c0849ae369fe5127803a55/zefepex.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04882e4aa0---rogiwuwubadifagom.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jhlcfoc9r04qr7gm2c6b6e8ron/jotevilokoworu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16073106a470bf---juxarot.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/zetudafojemoxujup.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/bemirorafuwoparuned.pdfIn PDF document text
    • https://designclarf.it/file/70546058510.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5a8de3f22e82df4707d99beaa88d4ba8/fozatubugot.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/bibafedevunomufomaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=which+robot+vacuum+works+best+on+carpetPDF 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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 17140 bytes
SHA-256: f21d1cc826e6a3868590ce1c8b4c94c3342d678cae69484e4886795589352e71
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 11072 bytes
SHA-256: 8f39a330a49fd36cd720c935f7d9f7c55621d6bca2c771166332370b151a4b01
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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