Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7805f8ff846a9f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 05:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77c9b6d741a8e676eff5abaf08ec4ef4 SHA-1: 01b221ba523e6fbb639064203fb87698ac08196f SHA-256: df7805f8ff846a9f13cfe39e75de4e9a355c62f7bdb1e1ec0bf23f6475612a9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://orsam.org.tr/paketler/ckfinder/dosyalar/files/dabonuwa.pdf In PDF document text
    • http://noithatphathuy.com/Images_upload/files/95223042954.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210913190810.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408fce52b47---gaxujumimetumibevowok.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/56286156575.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/jijubez.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/nozubugiwajefanonik.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/lezunelaxajum.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/morigewujifab.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109200528406461.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/57914832621.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6b375e669a6924169fb6f9321eb2f504/82858092242.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/37713049613.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/46335294803.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142256b91533---gilasog.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/12753276092.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/bakiwusaxirukakibasalorup.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be176f3dd---sikotiwige.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/gulopijorogidaz.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614615872d5fb---diwuvegukas.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/94441535214.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfed51ac74---momaworapiwiferavugufu.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/balimagozefovurezirofiwa.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27264416357.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/koniwaritepurixotonenapar.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/rigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=percy+jackson+the+son+of+neptune+pdfPDF 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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 11016 bytes
SHA-256: 855027095f6600783df29a4be89b8dd7216a857ebbafe76f425f3ad7d153f9c9
font_02_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 16684 bytes
SHA-256: 23cba0ff2daf530032e0bb59bdf3fcd51e6ad160fb465495bf6b6d0365368e90

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