Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d9bc3873006197…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 00:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 725ecb99d3dc0801b77202a6d34d1181 SHA-1: 7803e4c3fa259169e2ee3e4de55c0a9d2f572249 SHA-256: 37d9bc3873006197947183fecba190e6d2ea075d59c89de7d2c2bd9c65c3998f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=merus+tv+apk+premium PDF link annotation
    • https://confidence-ist.com/ckfinder/userfiles/files/rexulovewobujonimi.pdfIn PDF document text
    • https://tele-video.ru/upload/files/21269999114.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/talubafojadizelobunixi.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/rekuzowizov.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/molozowe.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/tokojava.pdfIn PDF document text
    • https://samowar.ch/upload/file/zisiwelodo.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tamaresabapomobuget.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/36539253956.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabipal.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/wavutigizumudovegulumoz.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/52012896356.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/mojexirowegoladepetop.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109141443215359504lziz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136943ed42f1---4613042879.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/65402466325.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/73381129927.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/7032489301.pdfIn PDF document text
    • http://www.polni.si/Images/files/bitaxusezopasal.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/gonuziwazumoxijamim.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/13949383010.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9f1630f3---84942578974.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd0c5842---55706430665.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/afc400eb9a5d7d1d4a10d50809734c73/64320976425.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/72588809159.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 10396 bytes
SHA-256: 69122bde4c19a72df1fed0cc0f0bcf203e6771e2a41af3de27e9fbee82069640
font_01_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 19464 bytes
SHA-256: 588db2eae82da984eed730c45ad5751f2596a0c1512662856eac1de6ba9255b1

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