Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fa1bbdba71b213…

MALICIOUS

PDF

123.3 KB Created: 2021-07-02 02:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf889ec4adab56570b9fff652a840fe9 SHA-1: f8351f6020e0e8031dd7c45c5d3dbfdb62e300ec SHA-256: 57fa1bbdba71b2135a4c4365cabfc2434efe287e0def82c8beb68b350e0826f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3c7929d6---73247753628.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/98b9a8fd8ebc99d31ecb6de1dc905ba4/zabemofixejaguligul.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/kutiwedezamubabo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/tolivuxafabosej.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607867bd6f416---miwutovutunaxim.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7c710ac9694c9506f66f46919913b88a/gejelepakarus.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/xisiwakazuvepumog.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eec861c31---69208308395.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7d5lj29v7e33lj7obcommp0mgl/22934339038.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/79648a3bc9cbcc3b1e3a4ced9d97d445/vipevonulajefunexet.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/79059980834.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/28574c1b7d2c632d00caa6df3d8d28ea/97686848315.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/rphvn7gm5fl176viirfr5tm2iv/pijotuxep.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98893ac669---votujisosekokobisofa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb40a3ca42---kipiv.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/86815066172.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/simixowubolaro.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c2jdusirls12pqip3165kejvh1/dupunokixopetemipenego.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qidmvf3jnjl8ugrhidfibf5ib2/didosejagof.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/jiwobaka.pdfIn PDF document text
    • http://classofjoy.com/KK/userfiles/files/rokep.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fc8ccadc---tekoju.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/41237939600.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/litupidedelu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2e9f25a5fd3084e9e6fa4f8ed6465e38/31860581133.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c507bbfee9---97850779517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=11th+physics+chapter+2PDF 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_off00017de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE5 18948 bytes
SHA-256: 1ec33d78372b8dbaae3099d4a497dc805872720cdbfd86e3af2eba4b39b299d2
font_01_sfnt_off0001b01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C834 10392 bytes
SHA-256: 978d48d2019b35fda615461da4a1e6ab7b37f97f864be4321649e87325959dfd