Malicious PDF — malware analysis report

Static analysis result for SHA-256 c811c69da88c2997…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 08:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7905a910aee25c2b4e845bbcde43f60b SHA-1: 5a234a237152222a44368ee0715a50ce7f18ccdf SHA-256: c811c69da88c299754caf9da878c2434c02f811f556c925078a12a95b80429c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for SEO poisoning or phishing. The primary URL, http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076057b71e21---51214680006.pdf, is particularly suspicious and likely serves as a lure for users searching for specific technical documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=fundamentals+of+thermodynamics+8th+edition+solution+manual+pdf+free+download PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/22b9e22254403853e6572929ef762890/32675189896.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vofadizerixotibaxunodomi.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/95505134494.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076057b71e21---51214680006.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/751d8674c531b99c3df435e835eef482/8451172856.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/sakamuf.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/94108870625.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/87622417634.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/dalanuxizige.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e25c132cf---guzekanoseforosini.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/65f10f37041a125a3030ad7de755e169/gebulilekapot.pdfIn PDF document text
    • http://huefpdf.org/upload/file/vemijepilulijovekoxew.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/20195379514.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/javozasamu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35f11d6f5---91361196540.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f24a87b0f896461d75aaa8a4d7c294c/divunoxev.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/90206446164.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6a224d87---biwodizaxogarajiroxuku.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zewabotamukiduwulit.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/lupekux.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xunupilusiwudekinila.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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16452 bytes
SHA-256: f6ad0ab1f5cd98f4e780fd8f438025b69039859bca44cd9e4b91690064610c5b
font_02_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 11372 bytes
SHA-256: 9ad7a381daa8a65bf533be302ff53e6ee1c960a00d066b57ea6bf578caece9fc

Open this report in the interactive analyzer, or submit your own file for analysis.