Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5a81a2c4ba76e8…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 03:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b860c2720fecc5f8a55dfe75666dceb5 SHA-1: 7d75b7f4d2efb461915857611083d21759a50461 SHA-256: 0e5a81a2c4ba76e802fc8962bbfd29fc48e89cc2fa654d74eadfa1d40c228470
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The primary purpose appears to be redirecting users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://infrive.ru/uplcv?utm_term=losing+my+religion+chords+pdf PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c267e7e51e9---dugoxowamemonab.pdfIn PDF document text
    • https://harmony.im/userfiles/file/xipapaxugikepawo.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/zoforalanifi.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/92927041125.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/m9flivj8dle85uu5rqd832o0vu/53433400197.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kosofo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e534272b2---49830727596.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/49000428562.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f215edef77---57804891823.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/12733424974.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/15628982083.pdfIn PDF document text
    • http://c-amc.com/upload/files/66243871390.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/61764097678.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/85275147619.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d0839120a4c0e2d46780d95c169bc61e/kojosuxoranurixele.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/7721329116.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vpoah9kq8onn253pji70lkrq56/xidugo.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/wisodijetetukoputekifi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9fba5cc17---46848507215.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/tufuduvowezudam.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bdfbe8f59---96171035255.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/77922553152.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/jokexa.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1708cdf8---44091288450.pdfIn PDF document text
    • 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_off0000c20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 10880 bytes
SHA-256: 2b987a8c644de3960281cc9c8d85c79cf0f27920a2cd7ae2d4d0f929d148dd4c
font_02_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 16628 bytes
SHA-256: 28f13af30edb7b4626ff50ce5cfc7fedc87287de60b27a37e090b9e11b08e143

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