Malicious PDF — malware analysis report

Static analysis result for SHA-256 56874aaad1f5a1d1…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 21:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a22eb8c22319e3864a5a2249bd60f812 SHA-1: 64578d42e1f8aa6a0c6309d381101a66b1c955c2 SHA-256: 56874aaad1f5a1d1deef7d030052412220d9275944434c865df7b9f162db211c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144a3c472f---dipam.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608af951db888---88620226242.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f367f13317---gabokelaluvozina.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/rujaxoru.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jfrf4lvg0fptgotc3ghhan7ec4/pezesofilasujizawikumek.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608049f7585c0---kinosadoxazoden.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160befde929f3c---69108795948.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/ruvefeso.pdfIn PDF document text
    • http://altinay-law.com/images/file/16175719395.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c19ad085d---93680967600.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16074021d27209---32258573412.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/85999603961.pdfIn PDF document text
    • https://parkettworld.com/upload/files/14159637849.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/33749963052.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa82aedc82---71082577214.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/luxose.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/wovefubosinu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/78623287775.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd837ac709b---libinemutodul.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/17474195556.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db1f820e8---84978537155.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927a0e6eb3---15726103452.pdfIn PDF document text
    • http://carszana.com/image/upload/File/45286826935.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/58899679335.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/rododuruli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=samsung+galaxy+tab+4+8.0+specsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 17808 bytes
SHA-256: 7e41445790f85c4d8e9fc0ca1716da5e80792e31e25d012a0b428fb3c4bbf68a
font_01_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 11408 bytes
SHA-256: 587a2db20cec55371018d981e8249297f0195f9b133e0ddeee05593f93a2567e
font_02_sfnt_off00013ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BF 1684 bytes
SHA-256: 57a73d877970e419005db3c38d676d43bf95a4071fcadb27eca2cd578d21aea2

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