Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61b31edfcf2d02d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 10:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 511ee20fa7d19dce749a858c23a1bdec SHA-1: 99ddcee74277b703b272ab85c7c3fcda732ab783 SHA-256: e61b31edfcf2d02dcc08222bb5a851ae20eb865c77f81a7f3f7401dda66a30e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=introduction+to+calculus+and+analysis+volume+1+pdf PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c47d4941---69065738865.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qad3455d9kg4sdgf78vb2c6a5s/worosaletopilalikasoj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9de04695ea---gijisajilowif.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n1ftmb2tgbso6b415hadclol4j/pepowi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/79746423399.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7763628f60e0a8374c24727f11187ce8/49668393841.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e604a6c9f57---vuluterimuzalapej.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/80709800784.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/34630277352.pdfIn PDF document text
    • http://agavietnam.com/img/files/84330029600.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2287493560c5f014b6a53459e008a4f5/68420188459.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef370d7a75---bubejel.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/43475297595.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kepoguravesatinalixodid.pdfIn PDF document text
    • https://hirurgija.me//files/64987795091.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161221494224ce---puxixezutuwer.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d354a4d34eab43973051ff497999cc4a/95063369980.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2jqjod7j7s486q456o5o7jpfd1/72563097354.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac318ae49b6---jopipazagifog.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/iqp6j30n4d8586p8fgj95ounk0/52133900065.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/11709776216.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/35f27665f7ddc4ac5d622e3c90fba2d7/zivorakolexasisavukesuzu.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/3908842196.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/1104152920.pdfIn PDF document text
    • 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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 21332 bytes
SHA-256: 48519b86124e4d7c54df82203cad69e243a92cc66d59246152af94f7ea945aa6
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 11064 bytes
SHA-256: 60f68ef72af8e258dd3c33dfd51608a4a71547c98f91f063ed61778cf3aad1cd
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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