Malicious PDF — malware analysis report

Static analysis result for SHA-256 e093a7c6555d6b14…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 23:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c87453083c4b0cba9b3ad3089f9363b5 SHA-1: cb9413e3b6b77cacb9687aa60b6f6f10c12c30ea SHA-256: e093a7c6555d6b142319fab5430004e42daea6e90b7018dd449d6d923cf26732
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links likely serve as a link farm to direct users to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The embedded JavaScript is likely used to facilitate the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421cacd1b6f---giputojozakoz.pdf
    • http://daisytalavera.com/userfiles/files/87862889994.pdf
    • https://xanbiente.de/userfiles/file/90265543603.pdf
    • http://hairfibers24.com/upload/file/45788026626.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/99322367671.pdf
    • https://conrays.ru/f/data/1749418371.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f2fd1781---xebejofado.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/gudawupinitirulon.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/42980025237.pdf
    • http://sun-green.be/ckfinder/userfiles/files/zuzibogewepejiremoj.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xisovemuvoxetep.pdf
    • http://autosoftware.company/autoresponders_images/files/76387311376.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/23937792509.pdf
    • https://paymentor.nl/uploads/file/bapotadedeximafela.pdf
    • http://wawa757.com/uploads/files/97838287547.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/woniniwerodulijetujavubi.pdf
    • https://bolahijau.com/contents/files/bimogumonomu.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb90f267b---gabarufenutebojitaw.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161409e0240897---94791570343.pdf
    • https://sibirprokat.ru/ckfinder/userfiles/files/logizumelepitana.pdf
    • http://technoauto.jp/js/upload/files/72060655111.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/rifixifisofe.pdf
    • http://etalentlink.com/uploadfile/file///2021092403542137.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=surface+area+and+volume+of+3d+shapes+worksheet+pdf
    • 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_off0000afdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDB 16792 bytes
font_01_sfnt_off0000c7ed.bin
68737f92200da87e606dcca412212095078352a896b0864051170a85457f3b21
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 15764 bytes
font_02_sfnt_off0000f016.bin
5048074c805ef61be9740d5331ae4a6c097a8935866510f41e05a4a0de739863
pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 11384 bytes