Malicious PDF — malware analysis report

Static analysis result for SHA-256 853f5fd94b0285c9…

MALICIOUS

PDF

115.3 KB Created: 2021-07-28 12:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 65149af440d17ae1169992042d48b553 SHA-1: b52b81c1c8a1b5cdd0c4ef1d6e1e17b4d1337c5c SHA-256: 853f5fd94b0285c90a1eb6647e6e5f9e4c61519033263761ceb68736699c4ebb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or traffic redirection. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.dismaplant.com/ckfinder/userfiles/files/sexipojab.pdf In PDF document text
    • https://securitydm.com/slicice/file/39189515975.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ruxalowigapidexegevipod.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/wixesamigevimojinato.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b79084cb4---xewemefe.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5f9ccdbb8764045a9984164b78ba4c4b/lojasisoruwok.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/zijafazekafikugineko.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tujuxamusodudevun.pdfIn PDF document text
    • http://jarosi.hu/files/file/mozolaginedaxiwirop.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3lmnsn174a4p2bcd9hltcp743e/wobulowudube.pdfIn PDF document text
    • http://farmina.ru/uploads/files/41199884891.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/bewoxilonititux.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/bonekovenowo.pdfIn PDF document text
    • http://safetypath.net/cms_images/vawixobekeraga.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073df5272f8e---91221096797.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf54b9452---nitulusiniletikewu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/muzukijasavuranegegagakot.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca562a9521---36094219571.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a228c3d27ce---63707357871.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607356e2d68e1---68538955989.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/83816113313.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/42230896705.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/33976778573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=grease+the+musical+script+for+high+schoolPDF 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_off00015dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC4 10964 bytes
SHA-256: 78054f6723cff40888974553b6787f225526404eed70cc550f1846e20776ff54
font_01_sfnt_off0001773e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1773E 18844 bytes
SHA-256: 9a6424c9c74cf4d778d6d3c68788804a6a2266e89a91824c0fb399aec1b6e176
font_02_sfnt_off0001a683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1