Malicious PDF — malware analysis report

Static analysis result for SHA-256 209727f69cc8c80c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 04:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2efd0af017dbe531d0e5f37fbb5da275 SHA-1: a1f841f0e4638e31419d566e4820ef72c373c045 SHA-256: 209727f69cc8c80caf7770c07e7e201d0e31d571805f9bc1bc9880c2ed6ffd44
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://krisoc.ru/uplcv?utm_term=bad+hair+full+movie PDF link annotation
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/70431319889.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/bd399e3efa5e3b0826ed4263b2de013a/47136079880.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/89681601289.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tozirunovuvomofeji.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bopokidotazexawezamu.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/zebovi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/45090996440.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/texararikubufa.pdfIn PDF document text
    • https://haidangpc.com/contents/files/nupodosufep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313bea6768---29835238945.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/53889395976.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109040252513417.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862f9b789c---88021885536.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13844150309.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tupef.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4f9f6e44d580aa59a3cd872c14758e3d/nojonikosinibanavawul.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/50986689267.pdfIn PDF document text
    • http://minipit.com/data/files/21250296147.pdfIn PDF document text
    • https://mangallagn.com/images/file/8830355611.pdfIn PDF document text
    • http://schokozentrale.de/idata/zimisigezanuwegej.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/72987425924.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/20636569245.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/ridibuv.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/37667038568.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/25975450779.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/78596570235.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 18908 bytes
SHA-256: ad0dcf4aa6872f932913ff651383a3813c292fc1eb509dd05f203e2c08c7b2e3
font_01_sfnt_off00011cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 10468 bytes
SHA-256: 6b873faf47a120686c3e0d91144bc9f834b10172b6fc9eed849a47c73bd09604
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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