Malicious PDF — malware analysis report

Static analysis result for SHA-256 2578723a76cea4cb…

MALICIOUS

PDF

166.4 KB Created: 2021-09-04 14:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1685056905d67ebcf82143322badbdc6 SHA-1: 57b825ad20fb0f8b28ca6bcc1803f7790446e10f SHA-256: 2578723a76cea4cb705063e56bdbb39b869f3ee022bdafcf7bc271bdd4b0cd39
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kasargod.net/uploads/file/83262978679.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/wibofovaguted.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff86f021ebb33cf02fd08da897495597/17466060100.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/zirugasexejoxanip.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/57826555606.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5d15809764e21befd35742dd6dc500b4/96971932812.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119e413f2dd0---56841177405.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d2e517fe---61951358002.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/67350417786.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25cebca9a6---larawit.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b030d85b6---xezonaxafepov.pdfIn PDF document text
    • http://unseretochter.ch/images/file/bazuxuzuradejapujerugule.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/20c11bf9f0f549230c9a65e87b757bbc/rezininaxugubabozijufibof.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/zenujiruxipofugiwojesar.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/jiligawadapatiji.pdfIn PDF document text
    • https://khanikango.in/file/71558118659.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdfa54bbc---liturezenaxim.pdfIn PDF document text
    • https://khanikango.in/file/limivupuwumurowidoxon.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d999edadb---32143134782.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3c2hgj4a2vcjqvng68ubc3me9l/fevuzeneta.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/81988350033.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/leiebh2snrk4uvaeeio0pq447j/kuxegepoxepemozazumasuxif.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/78347706865.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/2243418605.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nb37d8smbt927uvc2q4ef2tdi5/73061156727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=batman+begins+movie+script+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_off00022a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A72 11176 bytes
SHA-256: 9ad1bc4fb750b2cc0d7173b775d7f92a24da6ba0899eccf5d10d0489a0a12d9f
font_01_sfnt_off00024441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C53 18256 bytes
SHA-256: e2ec02f534a396b600a79e4fd56bc0b7412444d0987e4bb3a826f0bf487db2c5

Open this report in the interactive analyzer, or submit your own file for analysis.