Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed490c0b32816a07…

MALICIOUS

PDF

103.7 KB Created: 2021-07-20 18:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de9b15968be6c1286d0a7f1790f6026e SHA-1: ba72bc7606e2bdf1fa5c201ce98a973fe230a3a5 SHA-256: ed490c0b32816a07b6ad5474b1e45a07660fc168ba1d36917c9bdfe0c8883088
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous embedded URLs pointing to potentially compromised websites or 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 0.9737

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://widepolymers.com/userfiles/file/92074821686.pdf In PDF document text
    • http://malabarisproducoes.com/arquivos/files/pixizobigu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tuzaxopaluwuxowevarikexe.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/53478987769.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/bolelimu.pdfIn PDF document text
    • https://peterdegendt.be/file/fezodegugipixolenaralene.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80d0292b2---81147922452.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07eee293b---55223905238.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zuxepasufusarapaxuvuti.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/putumadamafe.pdfIn PDF document text
    • https://t2sc.me/userfiles/10036941004.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/uhilcgd64s4o97ralf25kf20ck/leputiwukopivivabos.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9e8a8dead8a34bb88dabfe2623242f95/livatokugadurugisupuxa.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/zotenobulud.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/diwuf.pdfIn PDF document text
    • https://chptravel.ir/data/file/65661588112.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/99978360347.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a0c7525c7---70950659267.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46e06a970---xumewiza.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/58770608585.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0150feb13200d3101aa74734e2d5f1c3/85470092916.pdfIn PDF document text
    • http://tele-video.ru/upload/files/71807232421.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608824199eebd---28625778902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=yumi%27s+cells+my+dream+housePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000157d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x157D3 19240 bytes
SHA-256: cd81820ffc007ebe8e3e193b186ca9a00bad2a778450731309c6545f532b8b7c
font_00_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 6608 bytes
SHA-256: 2941902147cb164954aa905425fcaed7be3d0b431dc8a8537372f33f7fe661b9
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 18720 bytes
SHA-256: 3b8fbeeb7c5c6db1490c062d540837ed8397135534e2d4f7586031b31af70bc2
font_02_sfnt_off00013f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F66 10664 bytes
SHA-256: 46870b8eee6ca6386e79602c0ee1c15fd0486dd1902437a19f00336cf3ccc312
font_04_sfnt_off000176e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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