Malicious PDF — malware analysis report

Static analysis result for SHA-256 d636d71d547d903f…

MALICIOUS

PDF

86.6 KB Created: 2021-07-26 18:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2368daa833f13756cdff89fd68151819 SHA-1: cc534bd619eea098f24f6a25997fad4db794f967 SHA-256: d636d71d547d903f0b58a4d152b64bd2d0885735a163b2a9f456b5f27fd77ee7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains embedded JavaScript and numerous links pointing to compromised or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of a link farm on potentially compromised WordPress uploads further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/47418869910.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/74925170492.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a2b43c30f---36010856831.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc28bd5fc---lizaterugidibiwiri.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/53048895808.pdf
    • http://icmasistemas.com/userfiles/files/lagarelobejovujupojizib.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/503511ad12061ab0cd2c3bacfe02fc21/73582032935.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d81398508---30836443523.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/zevoweleg.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508230058576642.pdf
    • http://marymo.ru/uploads/files/42623204857.pdf
    • https://asi-filter.pl/files/file/92369166817.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9btj911psjg7n9vfiibdhv5kos/61781948992.pdf
    • http://fdscience.com/UPFILE/userfiles/files/rawinutepuxe.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7571e8435e---59387426471.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33640c9227---57420335219.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d33681ab4---33553576939.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2665e4da8a53974811a3108bae5d91d5/fekotaxoxirowifogurapeg.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cqg0svs4taflbiavn2ubeqmj67/pipemi.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l9tf9jpbfhca2lgdqiskfcqhg5/mimuso.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/408cdb8ac6680bbd518f3385d343ea54/dagosokedefume.pdf
    • http://chikatere.com/Upload/files/52176727877.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/270628ea39a5552d9c9bfae06896d9ce/65010077049.pdf
    • http://greenplanetnepal.com/userfiles/file/72595346797.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+submit+aiou+assignment
    • 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_off0000ee86.bin
1c09b7581f45d8a9a16a2b79df803315789fb459c4c92caca70364bc5c68cb12
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 17268 bytes
font_01_sfnt_off00011b80.bin
4614b72b4a477913dfd52d17338d61ea74bd56f70e3e9d6636b339d848613f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 10620 bytes
font_02_sfnt_off000133da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 16792 bytes