Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf83b361a612315b…

MALICIOUS

PDF

88.6 KB Created: 2021-08-13 11:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6560a093087589245b47ae0cda648d80 SHA-1: 17f1593e0e9b05860f012f912ca7c95c14b48eb0 SHA-256: cf83b361a612315b0a6e5364efa7f14eec2be810e045965f296fb8c77df54463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=dna+transcription+and+translation+coloring+worksheet+answers PDF link annotation
    • http://hongshengfish.com/uploadfiles/2021052405433161222.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610db83cac9e9---pawuzode.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/77972655460.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/demiwifu.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/kolatidosutitozawipop.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/16307072578.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wagovopexutavegigezejo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/lovuma.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cee554c9bf8e780001e74abf17856382/susimitap.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ld4rkknbjnkps8jes5ko15rl8m/54714154842.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/de908b1e4cd8ce204f073462171d53d0/sipelerekimu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160795e7d5b971---57523287984.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b7ef3bd8---nipisubeforo.pdfIn PDF document text
    • http://yuha.be/_files/file/58964133497.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e72e8dc6---nusuwowitimalut.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/53409917128.pdfIn PDF document text
    • http://schokozentrale.de/idata/veripetipukiseva.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/gonuralexufogat.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/484e9fba90f86105c63e2e101d15f1f8/30749792964.pdfIn PDF document text
    • http://stasta.com/userfiles/file/91433035634.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/gusuderinefomozajomufefak.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/zibezirazowiwewexuwiku.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/498884a0604d52c518d1b3eee82af670/28343909647.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fijevabomoxepinumem.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/14479467854.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7b00d4677eced301496cd2e97d85a801/22477162995.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b0hmgaaurq37ofpoktco26erjb/juvajimamewijawokigu.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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 17036 bytes
SHA-256: 2b4ba24f49a4d34ba35888fd7c15d0915c444b53a3bca771861d492d04c410aa
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 10972 bytes
SHA-256: 03f211f8b27d3812bc15c2a6df37107463578c292840723885f749fc139d2bdd
font_02_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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