Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7794e97cb165a02…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 02:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe63f0269e4da0efbc82ceb0f5bcefda SHA-1: 40124cfb19966ec72d4cefccbf80775056086797 SHA-256: d7794e97cb165a026881fa5b21ee2c4087e5db9eecee1086ec4a91fc20a61bd4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with multiple URIs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of external URIs and the link farm structure suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://mediaskills.rs//files/96165975178.pdf In PDF document text
    • http://teifsepahan.com/files/file/dedibes.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff354574bd---depodejufoluwebififed.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767408954cd---vofiza.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/wikixosaluw.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/30ddc4a8acdef66a79347eeaa47024ee/98541545173.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/sifodave.pdfPDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7330ba9aa---40490363345.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/70402048806.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/47681510612.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/38961310464.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/58u5n5qvvnomfc5ae1r1m1jct4/41774867415.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kadat.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/netutofuxudek.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/5412416555.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/pasexusigowufuxizixu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ea8fc86fa3mov2fi4svlhhctfc/felosopomakejagobujifibur.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/lunetavefeximarate.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/jejefakigutulusonutoxun.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca1c51721---26055382043.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/dejowapusiwan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=livro+ortografia+ensinar+e+aprender+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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 19084 bytes
SHA-256: 2846c1ddee51d7f18986c4d27219119ad3e1b8bd9f5831a81ea2d249f160b248
font_01_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 10652 bytes
SHA-256: ce37ec8fd70e06ffe1090c6f3a35d2c7a20c7338a9a0426b8dce669d9b1dcbe0
font_02_sfnt_off00013597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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