Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ad1a9e0289af76…

MALICIOUS

PDF

90.9 KB Created: 2021-08-10 04:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4584ef2ec6d67565ccb2e627f03a8e89 SHA-1: 3d0e6f0d4e72b1e967546501345498fdd1a525b4 SHA-256: 35ad1a9e0289af7694de0deb6d9340e814e1cc1495238b9e2c0de80d5e6d4579
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=how+to+find+term+geometric+sequences PDF link annotation
    • http://galantemontagnana.it/ckfinder/userfiles/files/68813437765.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/7558759802.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c03b4a1760721ef4458fb56a2a44fd8/31801646724.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a88494490c3cec84bb29a02152f62241/ganumonikurifuzu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/17926356241.pdfIn PDF document text
    • http://rayer.cn/d/files/sudolerubafejanolemupo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5a2tjd8t1mi9h1a311e61sr3c3/benije.pdfIn PDF document text
    • http://topstec.com/d/files/zutivib.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/muxusufat.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08b038cb9---69992956527.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/9514007255.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d8dc2ecf---rutikivizajokobagukejofux.pdfIn PDF document text
    • https://tangente-mag.com/img/file/8675840405.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ee5jc5199c2mt70e3usn62kdjp/51963217857.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/12759822346.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/sirabikodewomokuponumo.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/xiramajitakaworatikudadux.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/18722088807.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/suzovufofodamejux.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/87020898394.pdfIn PDF document text
    • http://derma-dts.de/files/file/nojitibutotonikebakov.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/26414952738.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/15781417786.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 16892 bytes
SHA-256: 0aacfe693b52cba2f189a5b00245d386904233aada77985ac4cb2b3c770ad374
font_02_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 10936 bytes
SHA-256: 5333afc75020938999de376e71cd07124e9579372bcde5011128432470e4defb

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