Malicious PDF — malware analysis report

Static analysis result for SHA-256 3769138a5f78936b…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 05:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f2bc1ccbde04052a60a2de5340aa7209 SHA-1: 67f6dd4905e6d54577c9ca92d6979ec95f47be9c SHA-256: 3769138a5f78936bca91ee923a5cd8681e62db836bffe09a3edefd92e29fa512
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of multiple external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1b713abbf---bukavorujajawagaguxuzot.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/gopabatimuba.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/kobamopijutasalaga.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/bumokezuruwefokajewi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jipuhrtmh2iuum03v58fql8m81/3000432410.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827b328f54e---33832598299.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da5a7234933---tanumimeroliwapuximozus.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/db0ecebea24040354741b52179bb471b/roxiwefekijomunaxu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/18715757076.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f77dafc7b---68621558779.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/942e18d33f8ffa58564ca723b252d238/tomidufezumaz.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/mr3cvggckds3ba9v516konecka/28641437722.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dgr61vccgper9l81o4bnmajac3/99542117473.pdfIn PDF document text
    • http://biomisszio.hu/tmp/47116666751.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc169e21a1---remowazizajafupojofujogil.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/pidelaxorazoxejujigomazux.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/71727506349.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/kirupexunaxuxowuvazuxilil.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b406dd71938---73027830129.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/16952718639.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/53380790618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+hit+a+golf+drivePDF 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_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 17492 bytes
SHA-256: dc16293e93c74988bfabc5048eff0661a2195c6a49f889bdeab614d553094249
font_01_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 10504 bytes
SHA-256: f09084c4f05145b7c2f6873ca508fc6a207f3fbfe907cc3fefacec2c013239a1
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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