Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc55fc71870f39e8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 08:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 550eb1ef56d252a27d76d7f70e12dcc0 SHA-1: c773d7157696e8ee6034aa7e4d2a6f5d2ea1c8ae SHA-256: cc55fc71870f39e820b889d7c6de060ed6dea02ac32ca6990df34483a92b2c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gdaniec.com/upload/files/26027378775.pdf
    • http://grhs1983.com/clients/72571/File/59164575565.pdf
    • http://churchtextile.com/userfiles/file/69326741841.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7npff98sesc2vdtiq8b26ce6k5/60910105551.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/76aba6f34293a9ed5c43b34e78f4362a/xejujub.pdf
    • https://hansenlight.com/UploadFile/files/malodi.pdf
    • http://libron.pl/fckupload/assets/file/wirak.pdf
    • https://vieclamkythuat123.com/upload/files/32483969987.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7a0dd9689eac35c39bb0e014dfd7a796/kedizovoguj.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/20b987564995c416e78ca200b74adfc4/ledulazijafe.pdf
    • http://kleni.cz/userfiles/file/79429250759.pdf
    • http://babamoleskine.com/files/file/56399971619.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/mediregipojuxibojoxulonu.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b1f8c485fccdc3b79db1407665f6a9dd/kegidelusoretewitulazudew.pdf
    • http://naturalmis.com/userfiles/file/menuz.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/3412045366.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795476e99f5---51037899063.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasatafipilapowo.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdf
    • http://hrzservices.com/uploadfiles/file/29594181822.pdf
    • http://boekenwinkelindex.nl/images/uploads/55326121487.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/52399989330.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=verses+about+loving+your+enemies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df45.bin
20e106f67601dcb0a0c7b5c6ac232d8909bf5c4f3021962c7cdde16e8ed34ddc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 10840 bytes
font_01_sfnt_off0000f853.bin
2adc685de53acc8d1cf7d0dfacb464535587d7c2c4700e921d5183a61afe56a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17304 bytes
font_02_sfnt_off00012497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes