Malicious PDF — malware analysis report

Static analysis result for SHA-256 49072b03477f7061…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68df22be519514ee98ad7a728d07a29a SHA-1: beaefa1fa81da34f072b7f4ffedbc74e46bd033f SHA-256: 49072b03477f7061d2bbeb1e77460fd25929d3c5a9e5edd45813b6425798d459
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=matematicas+2+bachillerato+pdf PDF link annotation
    • http://eko-baby.ru/userfiles/file/58012378751.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jedanirofijazur.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/sadopumereguzanisagar.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/nirutarewa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137619591702---lagazavofumi.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wilixidumewarevetepi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/gaxawojokefonogopogup.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2b0602c---28399583267.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/56439458471.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/lopudevowa.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/8064282997.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/81202393946.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sirapijifoxovafugam.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/zasowegapusimolobopunok.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210911080437.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/zigenanivijixifafa.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xafufepixejesigunexomesej.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/zetevunibabodemagewa.pdfIn PDF document text
    • http://teifsepahan.com/files/file/33884435434.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/genatat.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/80265866923.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/rejowunil.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210916_19949FF8839B1755.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/nafogirup.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/f1da7ftac8donukfjc6g21j075/65863728735.pdfIn PDF document text
    • https://toocapen.com/files/72719646698.pdfIn PDF document text
    • http://bociany.sk/media/file/giwenawubab.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_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 18036 bytes
SHA-256: 3944e0370d0ba7950125b7e163c9b6afbf8a347cecdafbbd556c8cfd7f26dd91
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11032 bytes
SHA-256: 32468e4968090d6b78b5cc70081952f243582698e392e8f7f4153ff129f10eee
font_02_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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