Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a32c3bb436a59c…

MALICIOUS

PDF

85.1 KB Created: 2021-07-16 19:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d40620bcca0df148c0396c516a089260 SHA-1: 5ccbe6ecf859cc5a5aae02e5c81df4afbb43c3c6 SHA-256: c7a32c3bb436a59c92e448ac2457cc32952df82ece222c1d39df4453baaa070b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of multiple external URIs and the overall structure suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dentalclinicbangalore.com/uploads/titapopetekesasapi.pdf In PDF document text
    • http://camel-republic.com/media/userfiles/files/nozixalubefijunomegiz.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/85892024661.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c189e2368ee68ce5dfe929291f237a39/bavupewubebiwumarubuz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d40969421124eb2782572311628d1389/52852499762.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095816f2ae0c---74998240317.pdfIn PDF document text
    • http://apcmagon.com/userfiles/tulejixizidubexudomi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67307959597.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/d8liko7rpfqnn1rl5fc2ukg162/wulaporimakukotesasifer.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f4b82901---85782083908.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/waxoj.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/75993941242.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/r6nfpr15trfnoo2v10nqdlepj5/wevapajumej.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6ktd8s6kq41mkjb3986tfvh616/zatidifagonex.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/sevurinakuv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10f4270785---lefedafifejig.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a7f191c---vomasirovujobokir.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d8e3a7095---43044636830.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5e22de87---fadojodale.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d080529132---41825911275.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/50654364205.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/66905551530.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2ab7a3da---sutulevijivupejegi.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9c7f70b6b2b15b5c24580caf64e5bc5c/dezowiselidowizubilojajo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b271b87194---28079362024.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fitudowulalamabozaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=automobile+technical+questions+with+answers+pdfPDF 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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16900 bytes
SHA-256: d3e8ffe70e3bb766ca456dc415f4f17cdc42beebff666df00f92b11391f7a34d
font_02_sfnt_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 11340 bytes
SHA-256: 5ea6379430659d378a52d2b5380a7d87227e151337a4cc0a9574d4ef0b777d2c