Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fc6d26ae599029…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 16:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4976f5df1cb52f46b0609db5ac0ed55c SHA-1: df2343b4ff0c1bc059d28a1ba553c1a9a5693d6f SHA-256: 97fc6d26ae5990294cd76cd0e330367bba6c5b1b867b6ff03e344034d7679376
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=streaming+film+hitman+bodyguard PDF link annotation
    • http://thietbiotoviet.com/Images_upload/files/89655478207.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vosokakagi.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/560aeb424000b0586242c576166e0eff/1827485329.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/juxoxa.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/zafiwamogode.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/3065217291.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85712826277.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kepobatebefor.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/15434602017.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zagofedokolisejowixuri.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/37380332132.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/41187665407.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/kurotumifu.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/pexutirora.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edc9e98f4---79272912392.pdfIn PDF document text
    • http://taxfreepoint.com/file/71431719040.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/dexodogepitapasin.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/kakekidulolurosimepuwapu.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/46675846624.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/tejavul.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/4075889140.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/23862894339.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/94631906837.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0e44a6f9---68956665393.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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 11060 bytes
SHA-256: 93a417d58f7a909e81824071c8c6c59e58399a74a19e8ae79b9f0adc3ee74df3
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 18472 bytes
SHA-256: c18fa14a76c2b4246941b217b7bcbd8a44569982c7fb0d066bc25621405e36b1