Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1bfcb035807383…

MALICIOUS

PDF

90.0 KB Created: 2021-08-05 11:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 818c9c7fc80d46927362e2c4afa061fc SHA-1: 92bd18221a7ab86ef663fe2d09edf45d70b170f8 SHA-256: 8b1bfcb0358073836334de613bdae10e63e6e2ebdd25ed999d582044d638da3b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious content. The primary purpose appears to be SEO manipulation or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/la8blb9nioa9k7e3501k47r3g9/kavafipuzejovameruwikid.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/c5ktagpm21nh8hkqllikpobl8t/gobojegegevazulof.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1f64a2c2---pobag.pdf
    • https://eviinstall.com/userfiles/files/bawozaduwig.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/792c2ed576b4a53229e27d38ecaa1a56/wizesixoxafabemivakivubu.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb23c0813---ponupifulipamilan.pdf
    • https://foodphotoshop.com/userfiles/files/36705807446.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/derizekejojitupafepuzem.pdf
    • http://alemotta.com/resources/original/file/nuvulosemazadusopaxi.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fg910ovj5q9d1mt0rvgg5kcf51/95211782962.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/m53bsc528mh68cauirfc97mggb/tesinipimijosibe.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/85b2ebcea3a68a9a8bcc43a2a9c885b3/37527731660.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b5922454ee406675852050e9776acb5b/81271429962.pdf
    • https://tramhuonghanoi.vn/upload/files/84505194736.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a37b6e1e---venobot.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcccf8eb6a---wosikodis.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ajoh16ualgkpl9bae3r5nk588g/56998063740.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/digizisifexilexovire.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725b95bca3f---51616711979.pdf
    • https://emilline.dk/ckfinder/userfiles/files/panira.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bbb6fc9d---rawevekinugafuzubajazawe.pdf
    • http://beijinghuojia.cn/userfiles/file/29303685116.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da5b2020e---jipupunu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c7c8959f---bajapamezoxizipiwugobosen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gcf+word+problems+worksheets+with+answers
    • 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_off0000f9c1.bin
66a4a87af159d7fc35fae2d6e6fd1f9a108057e84376e694a8565cdf9521ccd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 11240 bytes
font_01_sfnt_off000113c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
font_02_sfnt_off00012bd3.bin
f3abbb9a9ef1fb733369eaea3e283ea68ba6707abbc06e5894b29f564e38b2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 17380 bytes

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