Malicious PDF — malware analysis report

Static analysis result for SHA-256 613a734a22d0e03b…

MALICIOUS

PDF

141.5 KB Created: 2021-09-07 22:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e9f00d4e3243791018a0aed11b18aae5 SHA-1: ad2e4b8623f4d7b15d41cfdc5ec3284cd0350806 SHA-256: 613a734a22d0e03bdff02b5c1eeb7eecf2b61e6e2111010d66de2e9367d24ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of numerous distinct hosts and URLs suggests a broad distribution effort, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d276acb261---wudeserinasoropun.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c4949979f---35934151375.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609839172f9af---fubad.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/safuladurofupekolaxutewo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608250bb4fc9c---44075154212.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa0b9c3a2267253314c40f64d396f7e3/bojilosisiguvawejaxu.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/23957713918.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/pisaxatokurupipajapeg.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/71064004148.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/80165098848.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eea0d12f4---47865203849.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/28239409049.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fcd67f09---korepibub.pdfIn PDF document text
    • http://hotechike.com/files/files/vokizumerawew.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/piraliseja.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/soeb3t120cqhgcumo4399l3qlg/12252576474.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210610033105339059.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kd48lg4jaqev3hpckphsqv15ci/38426513907.pdfIn PDF document text
    • http://coumert.com/images/file/jiganiforakipevanef.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/29726a4b784e12de267ce2f881fba066/tiloxavusewisopalak.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d8dc8c96---fixavolemetizupoje.pdfIn PDF document text
    • https://lecapsuledigian.it/file/31313913063.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/fifawovuzin.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/41dddc5dac53e9e969a709c16a2a8499/dotowe.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3lu7af50k04u75uq2s4sv93hm1/44488405867.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b590c1769c---15433411597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=macroeconomia+pdf+de+gregorioPDF 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_off0001bdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDCF 10644 bytes
SHA-256: c146dcbb28cd0fa8ba9d585f7bdd82fdbd397d164cc2de6cff7eacada67316fe
font_01_sfnt_off0001d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5E4 22032 bytes
SHA-256: 58b241571e116f7f67b8ec780cb7ac4f9ce30eda81cb966f69b054c1c212d83d
font_02_sfnt_off00020f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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