Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5596138ff08d31…

MALICIOUS

PDF

85.8 KB Created: 2021-07-23 02:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1148a21dde65259f5f4980aff1353ef8 SHA-1: 84064ff43246569e3a00126a11761c9f4f708f8b SHA-256: 5c5596138ff08d31ee93ecbbe805134d7882f6823b437f6794ee5ae010e2a2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, likely serving as a link farm to direct users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple links to potentially compromised hosting indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd316c3812d---latov.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734adbc16b7---29563603212.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c908343f---zaxenabugid.pdf
    • http://allaboutdowney.com/userimages/pitegilosiz.pdf
    • http://puntolinea.org/userfiles/files/vekafano.pdf
    • http://halaljones.com/uploads/files/tupob.pdf
    • http://palyavalaszto.hu/teszt/upload/file/lejovanawesikugopip.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/jumulubebo.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/duvelatu.pdf
    • https://habibitours.com/ckfinder/userfiles/files/juwejowojabiri.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3692d950b---viguwawopixotul.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1023042fe1---53695932545.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea11ed6d4f---51081429191.pdf
    • http://studioarclab.eu/userfiles/files/bolizanegadopukonedujixum.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/934f4f262c3fcfa1cb736eff44be2056/sobopelovomunipadafode.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3918ecdf7c69829cce1f0018b2f2ecae/24474546431.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0caf5e922---23179966167.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f3156e47---kakepovumafegobub.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zazomenej.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1460dade---vupinezukevaxuz.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ff9e3dd359d4344e2a370aeb195b88a/bonumonujumamodoxa.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d570a61eab6ebb7a5338ded5a93b1eaf/48315515253.pdf
    • https://leganordavigliana.it/uploads/file/jesixuxisigo.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95b8645976---92811461746.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=multiplication+table+10
    • 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_off0000eb80.bin
ea6d76437a4e5e2b63933fc7ac245f8703b6618e42c4228f59138c0094214fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10508 bytes
font_01_sfnt_off00010356.bin
37889354f9618230cba918097a94fa926f11e7ea0756c083b0dd7d0dcca8e374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 17424 bytes
font_02_sfnt_off00013147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 16792 bytes

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