Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb2001f1c7fd151…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 19:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54f92a4b201a3deba54ce7514442bfb8 SHA-1: 39dd672bb19dac0d303785f803734369515ebe70 SHA-256: 2fb2001f1c7fd151cdb26eb6a0dd77efecfb23db10c0e08fcc7474a6899a1dbb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://trustarshida.co/cache/fck_files/file/55081979150.pdf In PDF document text
    • http://jodhpurheritagewalk.com/images/file/tepusunoruni.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1792894c---67588599780.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/99195188372.pdfIn PDF document text
    • http://mweb.cz/images/file/60360604359.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0cb06bcb3---silozip.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56615747394.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/35276746900.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76beb59d4---15853459182.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rowuwopuriwojewuwite.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/24937386042.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/27856312676.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/lezalazibikojezake.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/88727333140.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/mafugokewuwibiwupase.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/72927470203.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/nexuvefuxe.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/dojunozajufinivum.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/joxalupiwixixuketogaz.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/34785701517.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136af7eb10e4---golufejasotunumikezob.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/nivenetaxatuzi.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_040440.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/jilozabifomatifu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/kowikemelituguliraput.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wupanitixegibuwi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mubexusinakojifibomejozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=apps+free+fire+gamePDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 10316 bytes
SHA-256: c600c6c5dc5c489268b8d2c306e7142863e7bea2df6acfeb9a4e8ac2fe14ba6f
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 17640 bytes
SHA-256: 38fa90b8f446de87a7150293edbfcd427d391f90e14ccdbfc645709a49b8a258

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