Malicious PDF — malware analysis report

Static analysis result for SHA-256 a993e7ac21f7bf1e…

MALICIOUS

PDF

88.1 KB Created: 2021-07-23 16:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca02dcca4f5f98d4ae6c3e8fb5a1371c SHA-1: ea35c412960c6d397edebbe587002c5e65268cde SHA-256: a993e7ac21f7bf1eb401ddf577c7b95c02ac3737cf3fa0dda4a55de9c28d2a8f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://marlin-aquarium.ru/ckfinder/userfiles/files/15957307184.pdf In PDF document text
    • http://bagliodeimille.it/userfiles/files/9358948784.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6dviubj7sg0r6g21llr3jf4gv/98409407633.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/14709833029.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/16041251041.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/zonubotaxis.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16098c305e9a85---varoxewaleg.pdfIn PDF document text
    • https://cubic.is/userfiles/file/70686520548.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/jabufafakogigerigaxobab.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/59807697880.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/59415393976.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/givusononoxinepevelejekej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080875f2c65b---rodetavumazifenitob.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/7404790620.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e088280cc9b58b5342017417406f8857/feridulodabutisi.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/jenebo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0hdnm1to6sfo4a3616ipdfg341/86335592880.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab4924372---58814853891.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9e36ad905299fed6c490ba27c21f1e2e/tanalodiwanoxudomini.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/fovimufibafemowajubetuw.pdfIn PDF document text
    • http://sdds.be/userfiles/file/pakixagovofadevezubusutis.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/fupalifaxugupawu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e25de9e15265976f8cc44cfb01489b2/bemitugaxekojixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=que+es+el+sentido+del+gusto+para+ni%C3%B1osPDF 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_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10932 bytes
SHA-256: b9fcebc15de247234d98d458b5ca6f871891ac598c2b9ee8868f29ea0ee0a16d
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 18040 bytes
SHA-256: a728e01b5ffcbed70ba1d20de45b6f370f97a9956fc290c12a91eb4253dfd7f6

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