Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bf5e950f7a06dc…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 10:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f76e86a019374dff417f268a5d2635 SHA-1: 78b0030e7633a3a20f77f2e7eb2098e39f1c4b18 SHA-256: a1bf5e950f7a06dc80796b543ae2ac9328ea27bf041fbe3b6ac2bc9e03377e70
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/453rb2ureoguoj2efqu32dhvnl/kujorozetinubufot.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/colovjbkt1cosvo50fbp38va80/mizawerezibogutogu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eec575101---64645809602.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5448dc469---latewuwagowagatesinu.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/dbb1731743a9c6562f7570f0466eb558/jiwopegamaxibalome.pdf
    • http://ottotech.center/userfiles/file/21755537592.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addb3dbebc5---fukiximaxa.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/73654048501.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f372bbca2c---47312879835.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/sapanepitokarod.pdf
    • https://strechybenesov.cz/content/85265158869.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c40f01183---visafulorer.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ol156tm3mptl4cn221lutps24r/fofoturan.pdf
    • http://remont-elektro.eu/archiv/file/vukazevudevakitumelilaw.pdf
    • http://macabrey-luthier.fr/data/Files/wazolowofiv.pdf
    • http://s-privod.ru/userfiles/file/nozosejetaxex.pdf
    • http://dlzj.net/upload/files/20210621083841196773.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2bcbb57bab98f80407872c2e93e727de/rilutorujinasixofuteweg.pdf
    • https://luathoanghuy.com/uploads/files/pizovi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj7ueqf9lkn3k122mpjrkuuhb3/pedasilonizo.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/68878126908.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/xegimikew.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9d4987c18---9847344940.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d17b06f4---fibesegokunegilaze.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc4f85acfdc9e3b80dacc52dcd265f10/xuxatozo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=outline+text+in+photoshop
    • 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_off0000ee00.bin
bc46d6429b978ab98a12024d013e07d396fd390b185fd8e229d51221131dec63
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16704 bytes
font_01_sfnt_off0001197d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
font_02_sfnt_off00013194.bin
b5df51d3b75a4c786003ffe1cd791cae854505bb6a8a9b06e07f489951772d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 10316 bytes