Malicious PDF — malware analysis report

Static analysis result for SHA-256 765c5c79668066c4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 00:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3814139df165b42e6debdfb83e7212a SHA-1: cc6adbf33617b7b70487e08e5020ec50ad1cddc8 SHA-256: 765c5c79668066c4a31b359a5e7ac497baec3649903c26b3dd08781dbfb7c2ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns suggest it's designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mientaytourist.com/uploads/files/mifedikegababuluwuwux.pdf In PDF document text
    • http://ciarajewellery.com/editor_upload/file/nosog.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109010804068138.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/digamasurit.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pedunusotez.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/59034222668.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/16115265875.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/besawobokozafom.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/50234244349.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nenakuvenedepuvakupof.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/15726762559.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139950e2ea40---zitotuf.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/mazinumaweruvekojowi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd160d86b---62822028811.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xupojujatojisibinotomadi.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/7721432242.pdfIn PDF document text
    • http://schturman.ru/files/files/64380524112.pdfIn PDF document text
    • http://tzsunup.com/upload/mudirixapixinumuvev.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139454c2c4be---10814613003.pdfIn PDF document text
    • https://kildevangen.dk/files/kusegepililefepetuw.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109091504202458.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/55387990502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+indie+games+2020PDF 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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 16532 bytes
SHA-256: e4da0e3d47ded30ff721c544f8be50ccf639b69205bf7ce16ca3586714667d9d
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10840 bytes
SHA-256: 798fac9a88c76fb4a5d8a222d1d4847e1cc51895d9be92de89f036e1ef8404f3
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1