Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acf2af1ab6fd82f…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 11:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 92131e5dd0a4dd1217a9e1970ee50c9a SHA-1: 5ac6ec78aba60adee523cbb770b4aad050d0ae88 SHA-256: 7acf2af1ab6fd82fb70b58c8e282ad59604fb67a7f893b5d3c13676beca02959
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6a4c70ef---xatogulaseregubuwodurok.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/202152720088345.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/fapegatiguburefisidudod.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983554cc89a---naroruzitofazulobapo.pdfIn PDF document text
    • http://lyshiying.com/d/files/zilafurogazamulukaruku.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae72a1599e9904c034fd73d43f1e1d7a/74119413440.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7c7ca3209d3806b3729c3f28d3da902/34561871483.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/nhd15us505pltt75salrfitasp/89833543335.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/64de7b3a75ff2ea3743813637ddd37b9/80296688322.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vktupfqvn5rc0o1f1bdmv70rda/vivifewajilo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210625214620996.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/h488u744fjo2p5nqjaiokqt7mo/tulilaburubuxodipu.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/puxodusene.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0cb544614eebf977ea3a291ca49ba351/zejevekutoremiwuvikitopix.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/62391684276.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04b00f21d---8470655287.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gadezixune.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4ra07dhs00jf6lavgeb8ph0e40/80717276481.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6431c8719---79098420220.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb956e24680---43929516692.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/xanor.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/62288341522.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e3d4bcd7---4413737027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=timothee+chalamet+and+rose+deppPDF 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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 25444 bytes
SHA-256: 5762c81dc948f968d55015a27341b83df4e8da362240a0feba48d70fb8aa7878
font_01_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 10740 bytes
SHA-256: de0827fb57204fc4025d883e8f3286a644c2ffa81870c7c69e7871745a351d70

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