Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecebd767f37e652…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 11:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eae7161bbee93ab73f8243aa968d91ab SHA-1: 15170c1ff17b4fc382125041a7d086061a61023f SHA-256: cecebd767f37e6521ec1fdb70a91edea6062c45e1da25991b4a53777bf6b6116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://salukool.ee/upload/userfiles/file/zotidup.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fntcrm8sl5g9623fa7g4tpta1k/monirisaginubarogev.pdfIn PDF document text
    • http://xtra360.net/campannas/file/34180355376.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/suxojuwoferetezaraf.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/24946101529.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/gaxibupaxosidam.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612feda03cd40---segerijipekobar.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/jevisipazogavunava.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/93684019268.pdfIn PDF document text
    • http://workontext.ru/media/file/12950248371.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/11023661599.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/30052413693.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/94036060604.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/95288089721.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/sixatojuko.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135682c64d83---90110758551.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd3f245bb---bonosewevakoz.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/80847843431.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/fosewofijusoganageb.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3bfe4f99cf8d4a7912ec5be2cbfb7aee/54348288803.pdfIn PDF document text
    • https://binhvi.com/upload/files/63468727685.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/40508063262.pdfIn PDF document text
    • http://abnicum.ru/files/file/jerukudajawuruluxumoki.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xomakudiruvakukorozimeser.pdfIn PDF document text
    • http://cy2hand.com/userfiles/jagipibubigawemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=zombie+survival+games+offlinePDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10728 bytes
SHA-256: 37f6b38f98158af16d9b014141f54c5d29915fedbb43a87e84a83491b7bf1d66
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 17280 bytes
SHA-256: 669c11d36d2dc2cb60014bc1edc529f4d25bededf7288ffc254c0055cb943a5d

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