Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0fb64d7c38e076…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 08:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 110252cb62f9e732d84c72f76a50bc50 SHA-1: c33c8db66368ab3af24372ff04bc8b1ad1a5dc85 SHA-256: ac0fb64d7c38e07674317ca3214ef2fed767e6fbb3d86f09d347c05465993573
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=palang+tod+double+dhamaka+watch+online PDF link annotation
    • http://epplast.com/files/file/gekevib.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/tekilitigajapaf.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/23865203094.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/ximenizodokupije.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/35719566529.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/mifonidowi.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/8632309089.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/xatitojenez.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/bonoxomela.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9f16568e---nabefototupawalotovolokut.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/wokudojotivijawizofiditub.pdfIn PDF document text
    • http://zenkatsu.dk/files/32744771409.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/59783406676.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/47561475663.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/kiluzodujowesokorix.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613041d5709fe---bulupototizuwixikuti.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/54632667874.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/nituxatesiritetigeda.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/76054325689.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/8496812285.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/xezuzab.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141421eccd50---xaduzetajopu.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/nofuwulupojavinok.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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10968 bytes
SHA-256: aa94de25df57bbb50cac213d24ccf6fa8579c0e9f2121c46af367470723c36ba
font_02_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 17512 bytes
SHA-256: 4546332942c284558559b70e786d14a7e3940eceac86f8e3a5c8af5c9beb032a