Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bc53bd3b856796…

MALICIOUS

PDF

82.9 KB Created: 2021-07-13 09:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efadddb273a94ba0876040b580957f26 SHA-1: ad3c2ea912386f9c5d91ca033c2b5b4e2af5b810 SHA-256: 59bc53bd3b856796aca7cd803d6791b84dd65ffdcd272e6d5a5112afe98748ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the primary attack pattern involves directing users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://lauraestetica.com/userfiles/files/rerawisokimitemutegi.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36b5bed07---38538323769.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/57pfku4d9je64chrrkro8aeith/14122111025.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608730935206c---14295106604.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf72deb48---kawakeju.pdf
    • https://bursakaynak.com/userfiles/file/tanejizebu.pdf
    • http://sequoia59.com/clients/867919/File/18499467301.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5a0113e4fd8ec230f82b8f8507bb0da0/70848130447.pdf
    • https://soudurelauziere.com/upload/editor/file/79158090537.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/doxukuwuzuvax.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d6d1ad06bed56c4ca19bcb70a96ab832/fuvasamosusipiruzikusoj.pdf
    • http://kleiberit.ru/files/file/29972108733.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/62530e4eb4e2277e5bad198406dc7899/zotukibakivotanovone.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8edf664387899a5771802bea64648498/tabuxuwavigomudu.pdf
    • http://sugarfree-gelato.com/upload/file/jetisunujevajawulakow.pdf
    • http://homeopathyhongkong.cn/files/82392546313.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/36996246a74317bffbb4345677f5681c/17379433967.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2722b3bd6---46363773237.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8c44eae81fcb92aa72f818a81bff293f/wakasino.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d45195be---52869185847.pdf
    • http://ahcxdq.com/uploads/file/282107319104.pdf
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/44732017165.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac2cbf8ce---vazenogedavan.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080097a8763d---napawegazofagufa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=truth+spell+witchcraft
    • 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_off0000c81e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 16792 bytes
font_01_sfnt_off0000e030.bin
e81922d34c092648b290c37ee9f1e7a6fb22ca0adf5a2363db94934d290eefde
pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 17224 bytes
font_02_sfnt_off00010d0f.bin
098f5beb8bc8766f92cdbe9aec80f4f90be75914ba25db6adc062a4e561357a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 10504 bytes
font_03_sfnt_off0001252e.bin
a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 17036 bytes