Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3c1d55832cdd49…

MALICIOUS

PDF

138.4 KB Created: 2021-07-16 16:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d8ae135ca137d77d9ba024a0bc53c60 SHA-1: b1e613edb495b28971dcf18a5fd9ab46b9067483 SHA-256: ff3c1d55832cdd49e8e1137a46444d20eae3fc0b74c3ff3ded58c6c8d90216c2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures to phishing sites or malware downloaders, aiming to trick users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bdd4bbc86c74b244911e4b4e232ffcd5/65797026381.pdf In PDF document text
    • https://capecoralliving.com/media/file/58718644732.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210613000809794.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d1063e72e52c2fb225b9cb021eda9feb/60506051793.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160babc4d5d51f---didelupenulabezofuvuse.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609450bde176c---lorawiwodatonijuvaguneso.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fdbd9e59086217de60ba93aa8c25fc09/57130550716.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/17505629962.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/dca7f1bf2947448cb2d3d67f6c235d96/53155366567.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741f136c9fa---27646075593.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3c5373691---54127409704.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b03a986225ad14a6072c967b55144fd3/naxusekule.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f07080152---28844733443.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6129626ee---2144670872.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9c1421a6a---tefamovufubiv.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/37a58765eeeba8c85b6f320a69e437b6/widuvoledekuxozodasu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb29eb6559---67870204423.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/zakul.pdfIn PDF document text
    • http://ellev.fr/upload/files/45742755302.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/53500821825.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/87ef716e927019b455c14d0e8095aeef/9694387700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=different+kinds+of+riversPDF 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_off0001be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE64 18016 bytes
SHA-256: bce38575a4ef667cbc2b984ceffac4f9133ce3e93e34d60ba727e8a03d26b59d
font_01_sfnt_off0001ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECE9 10300 bytes
SHA-256: 9ba4749d46b7cee954bdb21efe96ced09fa86cfbaa9d13cf01c102502ef8f84e
font_02_sfnt_off00020443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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