Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3b254be1fde3c5…

MALICIOUS

PDF

92.1 KB Created: 2021-09-09 08:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad47b05dd0d81cb7287d4b33c0a10aba SHA-1: 994536e4470f101f9b9482b6de11371716c91670 SHA-256: 1c3b254be1fde3c5a480f30160d912ead978de355328d108b07bd07cadc2727f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://ourconn.com/userfiles/file/202109082204359359.pdf In PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/kexir.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/rekuropavotudimuwedexe.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kgip08jgm0pduarelk3n9e8bcr/ligadineripilodimevog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lj1l4tach55ncp5ae8ogg7q3e2/73033674480.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/gonurowelomo.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/15800898487.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/bunukimebusoxosov.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gotefamu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370daf75b70---febexibokuvu.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasaderew.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130d332d5244---11703277878.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/56376325909.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/punedenuwizitojepanuvuk.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5283aa8d0---20255004814.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/nikameselivafesivezoruned.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/91539738661339849d4728.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/xudamagugofo.pdfIn PDF document text
    • http://yuha.be/_files/file/55741651421.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/momejebanumo.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nulupunemufutuvu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/27800645729.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/83708609948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=photo+background+editor+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 18376 bytes
SHA-256: 9086e1286b1d8b0fce3c8a6ca140bb7bb021d1836b1525b9ac9bcbed4280c99b
font_01_sfnt_off0001319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 10876 bytes
SHA-256: 92cf8cd19dfce0bbe5edc9bdf1e4d9170e60193acc2261c45b9f027ad05b6a25

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