Malicious PDF — malware analysis report

Static analysis result for SHA-256 7194a1b0a4f171ca…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 07:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17c5ba255e27964d1e01d1017f00b224 SHA-1: a635e30e473c91d10d9cda78ca1cbeebb257e662 SHA-256: 7194a1b0a4f171ca3f1c7c73125eb484b024486d0720db518d9f535d22cb05e0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=download+snail+mail+for+android PDF link annotation
    • http://saraiaser.nl/userfiles/file/jexovap.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/da56cf5ac209dc1c877c792aec86f42c/gatatar.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/82621447060.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/gevuvawixofawi.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/21589860570.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4985a9631be012c389b2e072787cdfab/koxeka.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/jevagixofipokamuzizub.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/62998184100.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/56269669226.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/sagurafir.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wutekidunafudep.pdfIn PDF document text
    • https://digicpictures.com/downloads/14450999041.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/j87ecep4ll26tge16ue06du2vf/jagubewuwedu.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/wimibetugenumegizineja.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/40722334412.pdfIn PDF document text
    • http://gr-chem.com/upload/files/jumaxunubevogegidoluri.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0de4059ae---85014859469.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/rusekuga.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bca660spetkp9564bpqsjn3kt4/45674605922.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e914e068a4---rikalawuzoxusobigosuke.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/48ab093fb6ee8df78b9c1093cc269a66/45103527604.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/41494026520.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/41546062056.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/92107317537.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xomawaxu.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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 10372 bytes
SHA-256: 048abe7a72dc8d9421dc849453a9521a72fb90c9d6cbbec10d36f90d479ec6a1
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 20064 bytes
SHA-256: 8b798d6778e0678f5f447e7eccc8b68ed934275cab09fa545c5735965e2ab4a7

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