Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eff15ed3b6b0b1…

MALICIOUS

PDF

91.1 KB Created: 2021-08-19 23:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a674e1f15e0a8cdcc6f25fcfe7af6f1c SHA-1: 7a3d57c429c88c6ebaf668e1be553b3e03b6ae53 SHA-256: e4eff15ed3b6b0b1f0cc55b5fd09d66625c7efeff8b99cf16381442191ade969
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or SEO poisoning. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dalnoboy.org/data/filestorage/upload/files/wasuvagubomirabajaj.pdf In PDF document text
    • https://yukkumpulgroup1.com/contents//files/85919545081.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/susokidirubi.pdfIn PDF document text
    • https://tl-systems.hu/files/files/kabadasixeza.pdfIn PDF document text
    • http://expresskaliski.info/file/feserunajikagenip.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sovuw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be60aba5e38---24922736797.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ac85e7a3---36820539442.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/teretedozipivagin.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/wominolo.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xisijax.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/71933882318.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wezotorasitilojedu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6952050b90---6017622073.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/59462403715.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16115e101ef770---25040408772.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/bujewobi.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/59409141838.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4b93b2d62767d20a748d90bcf2502f08/negadefivevezilonaketoxav.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/67683258883.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/baa0ed0399bd334fe0ed6c88b640e97e/35608580401.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2c236c4db177b664d7277e900e84bbbc/kafudofutokojuvebomogexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=modern+mathematical+statistics+with+applications+redditPDF 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_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10860 bytes
SHA-256: fd281b4ef9ad3f921bc8800037dbacc28a3e1bed298605316a87a50b5e25f75d
font_01_sfnt_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 17164 bytes
SHA-256: 2ba265506189c785d591a33ad0576e451e82d3cf0426d8bb74633c8548e9ed1e

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