Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5929386b7519bb…

MALICIOUS

PDF

78.8 KB Created: 2021-07-14 03:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b0d3b024b3380a1baf444572356894b SHA-1: 931ed7a1927c768472f975536c813d67b686bc9c SHA-256: be5929386b7519bb43de8f535c57b4096ff29dca840586ffc4bd3cc022ca4dd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d1e7784582f3f98e7c7a6ca992ecc716/vujitosivekujuse.pdf
    • http://anhbanglaw.com/userfiles/file/bomaragekubotudedelid.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/31f951c4f34dec35e533aeed580fbbcb/disupug.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5f07f05f4f84cf9024024c5483d4379b/gagututobijetuleki.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/442c20153bde1a1343d2c39747a0761a/30385154470.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa380efc77---bovonerijuwonibunaz.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085561d0a75f---38692373816.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/194haudkard348i98atqfsjtq2/baxaganezozinukopivawev.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccabde4d9f---rudokopivosigula.pdf
    • https://vpntraffic.com/upload/files/mumeneforujuvopawus.pdf
    • https://creteservices.com/FCKeditor/userimages/file/pejaxuk.pdf
    • http://scheiden-maassluis.nl/uploads//file/piloluroxonufetuj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893641edd2f---49644933853.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gr5vudcik7suc40s3i8nnjor2b/33677840184.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48375897d0---86756064307.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac0c543ec---67079034587.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9616mb2ivjcp17oofo0v3qriv1/pazapamepibiki.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dfca4bdd5---87553088123.pdf
    • https://windsbs.biz/files/file/89040200254.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1cc9da4cf6b83736d6f8f086b41b0739/59023825198.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96b12567bc---radalunidadebot.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/21949218293.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgoarhal5232efv4umnoe0jn7a/55765964227.pdf
    • http://flomojapan.com/upload/files/delawakonafajunu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+save+print+preview+as+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d30d.bin
401e94588efb311eb8ccdf5970ef59b60447a01917ae38db553f60e59df6d33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 10588 bytes
font_01_sfnt_off0000eb5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16792 bytes
font_02_sfnt_off00010371.bin
b263ca168346fb32b241925a3c161b9e99b29d8315716fb5c0055b8d8e5aefd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16320 bytes

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