Malicious PDF — malware analysis report

Static analysis result for SHA-256 890ba61d559fa74a…

MALICIOUS

PDF

103.4 KB Created: 2021-06-29 02:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3782c86235613b6636d227cbee248c37 SHA-1: f1e6eb6aaca04276c90d2838b6c33b5f791ca6b0 SHA-256: 890ba61d559fa74a6a9800dd3bcee3a5119251eb968ff3a8d200bfa01e9ab556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://ibb-online.ru/f/file/melusibumi.pdf In PDF document text
    • http://pileshoppen.dk/userfiles/file/71441430163.pdfIn PDF document text
    • http://hrudolf.com/userfiles/57997276958.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/4cca84ef1fc47513521ea6b9b9935909/vefukarizububasuw.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xuvoxoropo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8bd86a74d45c9cc5b0ac030a4eebb214/mopipikiku.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de7abbec45---77640570404.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7cb17b8a---11106200621.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3a2c42f3---rolijoxoruj.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7dc3591fbea4f65bf072e74ee1a24bbd/80386835183.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/967f675cd19e8de595ae9f8c7c25b807/4623390228.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070967e53274---wuvuveverolizivuxujexel.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ip2i23s2imv9l91m30fqh4mqig/tixavurufufofazik.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086564f98eaa---18811526189.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/70kmm66cn8nk6af8j0ovtq9fc0/wujuw.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b33daea2b1882db3678f8087dd81aeb5/43067032846.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bqp0mi2rihkh4670s0dvrlfu4q/88586317066.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/94i4742n8j6j7evlcdrh4khh6p/nusugos.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f2a7d757---57603391187.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094611a26a89---75814193063.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/82ace6f84049e192619c8607b379c829/45302165263.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/pelosuvigedexekelogenivus.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8bf8a6e8---totel.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f54867d8e---5380464817.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/jobotenoditulinuperudafi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1b43f055---rikugepogapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=independent+judiciary+in+the+constitutionPDF 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_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 10860 bytes
SHA-256: 4182767a6caf1f38be9c34d219d8213858f1274728a92ff8e6a1354d90e1ec3e
font_01_sfnt_off00014b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6A 16656 bytes
SHA-256: df2230dccec9be4659be51cc863001556dc0d91ea56273c5eaacdd3702633d2f
font_02_sfnt_off00017637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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