Malicious PDF — malware analysis report

Static analysis result for SHA-256 9152af5f1afb67ce…

MALICIOUS

PDF

98.2 KB Created: 2021-07-16 10:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b622562a8dc00815cbbb945f6df6eb3a SHA-1: 3350ac6c5352466c372dce3a2b7b0b5091554b48 SHA-256: 9152af5f1afb67cee3e4e7ad66b4f731e3f22009bdf954f610d22b74cbe40628
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. No scripts were extracted, but the structure and URL findings strongly point to a malicious document designed to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bpv1sth355u20fpiij11ggrtu5/5408171829.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607864bdb2de9---40001071674.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/34e18eb53d62b894b23675d758fdd7c1/99918569546.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fimadumirisepigi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac015bcd4f---83252818137.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/xatubakujumux.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/c34de3d44mfjrnf5ursq5ua799/sujur.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/30929102974.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/jaror.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/05250e44aa3db1ebc91d07645998b84f/21486238477.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/84148247363.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/74876340060.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/85245266288.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-28/20210628134327488231.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091b78488258---87034698580.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/89592279456.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/82697371288.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/20048854908.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9c56552mjnrrsnqtsrsfh9r55l/104700104.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec45fe19b6---mokatuf.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47af8bfa02---fijixatusukepeku.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/k2jh1ucb9e78rh1f764madf44r/51681699185.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/buresaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=strongest+reverse+cardPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 5452 bytes
SHA-256: 7f0d083751c7d66ba60815d6b0c4b565c23595002fd969a02a14ae10efb87a33
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 17504 bytes
SHA-256: 26624834948b2e9168ae4eedcdc29b4bef8f7bae0c9eaa637a2a9ac02cf1ecd8
font_02_sfnt_off00014b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001632c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632C 10548 bytes
SHA-256: 28e1394bb92e6c570feec3733f9a4e6adc9163cd46978364a5966305c6ae9331

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