Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03f6fd915e05e19…

MALICIOUS

PDF

87.1 KB Created: 2021-10-06 00:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea375115bc15f75c64d7c1df31054736 SHA-1: 1a3d6a2634d1ffde6cb4261a65e3170fc7931fad SHA-256: f03f6fd915e05e19a1d5b2e996237ab26cd34687c2d0e6b70980a2e9bc529c5a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external websites, including some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, limiting the analysis to the link structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chrisdepanneservices.fr/Sites/cds/files/89437909389.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/24327647180.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c87cd5239jothhmf2dqrv9gdud/vemili.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/03de254c51380f02dcbf1c420d1543fc/perawiza.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/takatujewu.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/zobipogezug.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/widemulorikapenig.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/juzefuzasafejuxibadutilu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wirukarene.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1632361755/file/50660229757.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/lujerurapufuwa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc85d35f8---6910302344.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecdb8b8c6b---vikarov.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/lexakefodokixobafiku.pdfIn PDF document text
    • http://innotack.com/userfiles/files/45404076951.pdfIn PDF document text
    • http://shopabrang.com/images/files/figoxosimitebajokuro.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/62514908865.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/68293558130.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/24063359656.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/36577617116.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/volurobaloxutotebe.pdfIn PDF document text
    • http://dkind.net/userData/board/file/85250112051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+can+i+get+right+with+godPDF 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_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 10512 bytes
SHA-256: 58d394a527480cf72928d6202bcea72c8c015bf09179b4f575b147b083708f2c
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 19252 bytes
SHA-256: 18b82e4e3543379f3ca0b846b5b08ebebfdd8f5a39891839d403b1966b837f02
font_02_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1