Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb1a309e80e2548…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 13:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57a366b3cd7d1e15d9351046f173ab84 SHA-1: c4910e1f566c4c381afcbded66c7f04a9c6d0e6e SHA-256: efb1a309e80e25488368fa2f82f119a52d645d90d84be19d08995fc556a2c6f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=marvel+avengers+2020+apk PDF link annotation
    • http://umffz21.ru/admin/ckfinder/userfiles/files/89622266851.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/91316915575.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/visajopurovomasepad.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/56983637827.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/9817267139.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f69e0900743a1ae1fa8a74fee5d1ff80/27875366735.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/xawerigovizubiwewujaji.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210907161534.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/84415948197.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/mibowotipufaxo.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/58633856987.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8185083141.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210923_5FCBF54A058F29C6.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/96393602730.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gojomejazamajenezoma.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c58522661---kunodevaxanorelejeduteb.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/84731468041.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/66996684857.pdfIn PDF document text
    • http://lejonhund.com/upload/geletiworozufufakategur.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/dajofipakeg.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/pitijevipagaz.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/011430252674.pdfIn PDF document text
    • https://artenika.pl/fck/file/kirusixirereb.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a33721d69772a1e63488ff877a9a3e75/lulukezup.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de06ade3f9---63778594170.pdfIn PDF document text
    • https://telorgabus.com/contents/files/fulutekorifalew.pdfIn PDF document text
    • 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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 10508 bytes
SHA-256: 6a65d9d3ab6a95947ef7cee2a77f6e0983453141a4b5c21fb74b3760ad87d583
font_01_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 16364 bytes
SHA-256: c83c7543a86ea9b20b71e6f8d5b214c0ca1f82e34ad7fe8a9555ef2e5570d7c1
font_02_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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