Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf2b3fc00aa44c8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 15:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfdd2510e99161a8a7e31dcf48fcf2e6 SHA-1: bd5ed2f3fe25d467b7699fc2c5d92e1b240b1e77 SHA-256: acf2b3fc00aa44c86ea7391b30731ee2e1df4ce409add3ca2913d511d3cc281c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised CMS upload storage. The document body is unreadable, but the presence of numerous URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laboratoriodiprogettazione-ve.it/userfiles/files/47205703979.pdf In PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/mozezizimamawukanijota.pdfIn PDF document text
    • https://kimcert.net/E/file/mebem.pdfIn PDF document text
    • https://esvigo.com/upload/files/zeduxutefawabidu.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/81489955982.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202197173175866.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161352d191ca99---zawusiwizefeminirete.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/64751988608.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/33417322167.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d539a41ac321636c995c1bf6852134be/jokadebojosiwebevizo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/22243249651.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jofub.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613675aeedd7e---femudafosorotod.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6be9bd1af---debirabekupovolujotifemo.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/palidamepux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae96caec3---dukidob.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/79653268283.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/dekodifizizubede.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e2ka6b73bf971suskivq9uikb0/jafexelegafogutepetek.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/53953576904.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tegejejajugukevoroval.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/59307301017.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a13f5bf---82233446403.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/19094706780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=married+at+first+sight+australia+season+6+watch+online+freePDF 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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 11104 bytes
SHA-256: e4e9db146663034b089e42ad348af7f7d71e3c5e7389bbdd6bee365af922b8d8
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 18516 bytes
SHA-256: 3c34ff7d8e1640701a1e517844e4bbbacbed6d839f87fa58b9e56a3a12df6a10

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