Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde4416a6b1b5c25…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 02:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e2977eb4b7d3a7e60037f12074ca6e8 SHA-1: 918b14ee7ce1215a66aa721b8c4b6aa946dd6f88 SHA-256: fde4416a6b1b5c2523c5a417e9ff3f122b7f197774dac81c1d37d6568793413d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

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 https://medvor.ru/uplcv?utm_term=preludio+de+adios+pdf PDF link annotation
    • http://raegcafe.com/uploads/files/moxorodewikatiz.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e3pd6mvc5gh2paacbgfdb8fbk7/54737595197.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aba00e831---kilosogapigijafagakadada.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/dca4dfe28f33218a6b3bd2e217349fbf/vugusefelotiturezat.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210707_E3B05D647A9BBC83.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/zifadumamapebumuma.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fae78254dc3fbacef006ce22743c3b96/53656648243.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/51879308297.pdfIn PDF document text
    • https://ijp2.com/contents//files/zuzixibiba.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zunafibirugosaz.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/21263394562.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/58028241475.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/buxefubokaladofoda.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/a9uuu9j5m5ue1r9ttcgk52ve75/19178127784.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/28575226232.pdfIn PDF document text
    • https://blogsma.com/files/69025100829.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/24c550620235ab5eb216b347a395790f/kekakesevorutupomunexifa.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/dunuxofuvofatalejir.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/18651102368.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gekifevagenabumomudefekid.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/20605686903.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/solekerobujimanofibiwep.pdfIn PDF document text
    • 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_off0000b2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 10392 bytes
SHA-256: 162723fc1b8b305ff7f9562809ffde7f60a83f80b2b790b5a13acc8bf7eec0e7
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16416 bytes
SHA-256: 6c0592e70786a156b64476e56d6fd9ef1e2d38dcb4d6640697883a07cbc94ea0

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