Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c628a0498051cc6…

MALICIOUS

PDF

94.0 KB Created: 2021-08-05 04:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 960e27dc860f1ae672de93fc71561eee SHA-1: 38abc1894dff76b1333b1f730c6d2148ecad3461 SHA-256: 4c628a0498051cc65f78c15d6e9d3670acfcbb665730ebb2ec3106f937b72b9d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating a phishing or trojan-like behavior. It contains a large number of links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content or facilitate SEO poisoning. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://yossy.biz/userfiles/file/sadizedikakowupomilejula.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p5labsdrb2e2j5jsdl63doa153/bunawowaxu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g45ga6uufehdqhvn5i0t6bsrdg/81249656092.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94e281f60---28182558842.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/81075079170.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/70713601746.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/17e43bace8c66e8bd2638e469b5934cc/6939142745.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/witowefonanexiduf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c97a558f6---ketomenenulemexewakopep.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11449e60eb---zoperawuwedolesizi.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/57247075486.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nuxorodabifujanexalavizer.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39dab897e0---kefavupasixegupuvas.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/oimvc2ltftv09e6cmrci4s3l3a/47023149795.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gudumelavenesumevofok.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e4494346108bd1e566378130b0d26395/memop.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/228413f7fdd7144b5b5223f2c63143be/nadezo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/66864347616.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/8066040554.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/vesurul.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097257bbd7a0---75390827289.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/74783341134.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507090245_1232637755.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mlon2jrv3c6lordo111634sj7o/35463594693.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/682bf2c4588e45126f1c65df8f11c9fe/65166554194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=1080p+bollywood+movies+free+download+sitesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 11352 bytes
SHA-256: bdfd4e9d761edcc86f29a2a1dd3f646b332fd16296d31eb8e7c73db13db96833
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 17264 bytes
SHA-256: 5ffa1b0732b9277b4749331a82e581c3c790afd24da1ba97d7e7feab0ecba97e

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