Malicious PDF — malware analysis report

Static analysis result for SHA-256 313208aebb31baff…

MALICIOUS

PDF

74.5 KB Created: 2021-08-12 14:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f66597a02f7cfd1d2de0db2fd9e1f53a SHA-1: ac68198d58a743dff67ff127255f907aec87455b SHA-256: 313208aebb31baffbe785b7f74c308f54167cd0e902a3faa40aaf2200e4df59e
156 Risk Score

Malware Insights

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

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 hosted on compromised WordPress sites and disposable domains, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://share-world.tw/userfiles/file/lumagemunelinupa.pdf
    • https://masukpt1.com/contents//files/25380183481.pdf
    • http://sequoia60.com/clients/875776/File/64020134621.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe45edbeb7---somonijusenofepasolaged.pdf
    • https://gilbertems.com/videos/file/10816185496.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/rolofapoluja.pdf
    • http://esthebel.de/userfiles/file/mepedokofedibiburiwazekud.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03sddr2dmsl2u8g6r0nj81mtu/tisexoguwo.pdf
    • https://vayamcs.com/content_files/files/mafusisimidokawuf.pdf
    • http://laxycoffee.com/upload/files/puluvujesixejozupawera.pdf
    • https://gelblighting.com/userfiles/files/midutora.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ec131ab8af0d9d0e7589dfa7321a9766/86817222485.pdf
    • http://learnazia.com/fck/imagesfile/kitudasudivepus.pdf
    • http://bluelakehomestay.com/uploads/image/files/vogotakuzaxenopivepowu.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gudiper.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dfd5e097ac146007131f97d89ac71ef3/75811999936.pdf
    • https://sanidom.pl/img/file/zalawofef.pdf
    • http://rajskiewakacje.pl/userfiles/file/davateduzegike.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082f096b8fbd---92155259538.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/19070730295.pdf
    • https://fablab808.com/nbloom/fckuploads/file/69841746672.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e6831e7a---fifegejat.pdf
    • https://szud94.hu/img/sajatfile/files/mobezudabakiwiwunivo.pdf
    • http://stpatricksreunion.org/clients/84553/File/10484100599.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161135bb34697d---jidurasefitodamob.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8d278d0f---78380475632.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/77150272221.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+type+of+intermolecular+forces+found+in+water
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ca.bin
58596a4ce3ac5e564ba2219d732571a00bc7456681d7c67f07220d84fdadd83f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 15604 bytes
font_01_sfnt_off0000e9cf.bin
a925b00367ae6e17885b59e3f81b938e7fb76a7c60a296c6f00504cd0b086803
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 11176 bytes
font_02_sfnt_off000103db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes