Malicious PDF — malware analysis report

Static analysis result for SHA-256 0777bc644cda79a3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 19:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1572d5d1f4e9e1978dd02a08ad7175d5 SHA-1: 347b892a6cfc7689cd20102e7764cb4024d97fa0 SHA-256: 0777bc644cda79a3fc5d49fbf7b7eb4edd7adc70e2c9721b5d30d5e95fccf486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cosyromania.com/media/file/42495453576.pdf In PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/papofikisokebek.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/7930271688.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa368d71705639b9ff077234d731756b/pimopik.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gaxesavulugetizoledanuf.pdfIn PDF document text
    • http://shamayachts.com/upload/file/92972101132.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/tagefowinigafo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/33b3e9c58feae82bc6fe61c83e3248f6/lasitikuwefusokafogo.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/xenafopanujekop.pdfIn PDF document text
    • http://wohntraumgmbh.at/sebutewekijuzip.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/47392115240.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed91e74bec---54072283580.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/sulodukenotariserepu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bef43bf86---kufurigoteloga.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210911000952.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/pofenanogoteg.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/rerukizega.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gekejamakubopepu.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/38843091432.pdfIn PDF document text
    • https://medtek.vn/storage/file/66114022822.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/59309412583.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906101448.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a076427fe---99574543748.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/2332398767.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/6868122806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=krunker+cheat+scriptPDF link annotation
    • 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_off0000befb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFB 10488 bytes
SHA-256: e6b7722187f75cdc7ad263fbbde6126c57ebc953a6f0086fdc52971018aae9bc
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16680 bytes
SHA-256: 9526c6258e2590ef5d8e06c81c39fa2656afcba3460788e021bc39f1d1f783c3
font_02_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1