Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d5d0a34ecbfa1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 12:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: af1b436cb5908bd6f8febaa1a7096065 SHA-1: c576ef8453d9e91cfdb4391ffeae7884bd861501 SHA-256: 236d5d0a34ecbfa1445782cc44cd21ed08a141304e07c17ef2abc4ffaaffed38
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many of which are associated with compromised CMS uploads or disposable hosting, strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://myphamhelios.vn/luutru/files/76416577088.pdf In PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/nuzalozibofirubemu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r38mq2qqk6ulkpbp19ul05uvaf/92333145701.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/49666142518.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090813492873499.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/39715522572.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_9B1D755C4D968CE4.pdfIn PDF document text
    • http://getvisa.ru/images/File/40780323252.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/13883718691.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430efad76b7---vamepegiva.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/39240569469.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/93178226385.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/10872072289.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/pawotuxomiwakewos.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/70802896896.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/37601489684.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/76061139911.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6a3949a9---putumazezojip.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/14430094460.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/zuniwisotizekifikusoxe.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109221227126023.pdfIn PDF document text
    • http://tyextractor.com/d/files/14119381399.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9c914a482759bb4c6e5944f95dbd97a7/38088245371.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/91107245696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+e+myth+revisited+book+pdf+downloadPDF 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 11224 bytes
SHA-256: 2688941e21b5cf34f735e333dac6e5be30ce1a69444c052c238c352baba9c58c
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 15048 bytes
SHA-256: e32f5fa19074eff57d68945473636e9974943ab1341bcc0dc45a08ea46343596
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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