Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b13a6647f8e1843…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 02:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a24696a2baf3681ab062bf8899c644d0 SHA-1: eba5cef889d371a659e3f6267c91635d516a5436 SHA-256: 2b13a6647f8e1843dcfcc738c8e3f26dd1f63bd9e536e3c18b0f15620f16b644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crysiq.ru/uplcv?utm_term=1+liter+to+lbs
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5013c07d---44048604802.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6049a3bd---koxasaropuxaxer.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da7d21410---8503598897.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d1dca97a---rozikerazovavefekisuvem.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/n8ors7rn7kbn4r0r7lrm3sv998/jedalodozelutaxejosipom.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/89helc1osrbktepri35aqorejq/tabaxoditofadivaxekoberiv.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vg6cs9tkv95i6a095j6ik9pq7e/88124316257.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e13b63c756f477656e7e2f97825ffb22/wiziruxi.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ecf746ca8995ea7f36f266dd70244031/jufowise.pdf
    • http://unseenadventure.com/userfiles/file/dorovebuseneman.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd53a6faa9---bigojosuko.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/83a362a72de7f9f85bb295c8dbb44e86/67395850217.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2uds74idkqdaf5ce5gd5rp483c/21314343484.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087697bee65e---kipawo.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kspkg6tn3hj8f5smlm2pr6s0pn/24420950125.pdf
    • http://boeschfamilytravels.com/clients/43210/File/44920628632.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773fe3e9db1---besidevulukikirazi.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf41e0a305---wifuvubobesolajinar.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f66ac9d2---nefukizidene.pdf
    • http://www.asslar.de/downloads/puwojot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7189f98d---fozofowojowotasulibilos.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee99cb7be---movexubo.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/folibaru.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ff0028e47---rigisalalirun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 16792 bytes
font_01_sfnt_off0000ff69.bin
1a537af885043f8b40d15137b0075ac058308601dce3c7054626ce4ad0fab1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 4080 bytes
font_02_sfnt_off00010f66.bin
ee9b988bf30cd76bda58c488e1e134bed256a37ce8531162e955f7603553c9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 19792 bytes
font_03_sfnt_off0001429c.bin
a6c6a2c74cb9fc4a7133136070b34cda7c506cf093b63df2a0d1478406593cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1429C 9928 bytes

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