Malicious PDF — malware analysis report

Static analysis result for SHA-256 107233156d21072a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 12:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb747acb17917efe7f70cf94f7c125f1 SHA-1: 84368b9d260da1a0c6cf24822b85311f2378bbd5 SHA-256: 107233156d21072ace28be7119793b8c4dad194008cc018ff43f9bdc326f8629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of `utm_term` parameters in some URLs further supports a phishing or SEO manipulation tactic.

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://synerhu.ru/uplcv?utm_term=yo+yo+ludo+game+download PDF link annotation
    • http://mbjarrahi.com/UploadedFiles/New/file/runelepogovirezelamer.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/xufomulup.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/17472175636.pdfIn PDF document text
    • http://santehnika34.ru/images/file/77074124927.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/fikaluxijukuxujuvigalo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/49262995600.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rutedotetodet.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/velane.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f9c7669c---zupixokapovuwe.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/29809643211.pdfIn PDF document text
    • http://htwy.com/upload/file/mabox.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/jemavawukavisesuka.pdfIn PDF document text
    • https://actor-conseil.com/files/file/88173889691.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05dbc16b2---ponada.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/dawoximanowew.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8ff5e4e0---47434696082.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rasazaregonale.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zudojororulixorevibebepar.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/94921144287.pdfIn PDF document text
    • https://ancoraeducacion.com/images/kubinejerokunukapezewi.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/77660801437.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/vesitetofonasedowonit.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/18221374394.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371885eafe6---leguvikatenavodezidibimed.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/mokebinizesobigolexilita.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/13153545777.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/92391418204.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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10416 bytes
SHA-256: 5debc956d5e0a726c88c83bf70ab5d48050563bfd9e4ba830d1b90b3ce0a4625
font_01_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 17956 bytes
SHA-256: a3ff10402f6e2286e3908e12bcb80b5f04505c61558a3e08a8e978956c0dceb5
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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