Malicious PDF — malware analysis report

Static analysis result for SHA-256 06635f2148f29b40…

MALICIOUS

PDF

73.7 KB Created: 2021-08-16 09:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b2a16fb583ac7dfbd55118680b4c90b SHA-1: a92d0fae12908a2a736b80bc21c7b04d2f6c4743 SHA-256: 06635f2148f29b40d414a8ac12dc821f7cfc0d8fc241f79e80360da3f59c04ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results or user clicks for malicious purposes. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878328d4ffd---sixunazekuzuzigeduwo.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/87618276368.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/37227857400.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/xujeginusu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa6c2df20---monotodumajodikadonifi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbdc47f82a---fejugorufopupepagoxox.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b02773fad1c94ed7e1b6811f90314886/22587342616.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/remolidajew.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/92928808712.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/c2ecf559bb52dd8b45b0b8c1a592b8e8/latuvazu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1e010431---kafavumupobadudexedamuvow.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/53802037056.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/59802230211.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/tekivukiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df7377e02---59732912752.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/86738074281.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/85146856982.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/20125891381.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/tonigekuf.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/ledefikulazixaxifugu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/647e2224c3511705e9a00d56dff9ec1f/mimepa.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///60571668367.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/faditizomonez.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bec2793185f9f2198a3a28bb32d2a91c/jugivuwebazijesexopukorik.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/584236efce2f5f2db70535ff88aa5680/69233593470.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021518222456181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=il+sistema+scheletrico+zanichelli+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_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 10896 bytes
SHA-256: 0fb608c55a9df28ecf5795d00322611601dad15353efb46f5a4716db33030795
font_01_sfnt_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 15116 bytes
SHA-256: 7d84d40933a4810042563fb70b8d5b2c618923668a7853a544527c39fb8c375d
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1