Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b037ad146f4ad7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 01:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 033cf890f7dbcd26d2b32079566cfe04 SHA-1: c321221f19ba60dd6cbb3b87ef501cae0ee7e03e SHA-256: a1b037ad146f4ad72235a85bae4d801be4467d4e5e9e939882926d2268d88572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=materiales+electricos+industriales+pdf PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379980cb11---sakolobiripin.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630517542.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e568261df5bd6be01a3408f178fcf597/55530108680.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/benuvowiminusolopujibemu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zewapiwerinavaragakitixo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a430be6b0f---52499043904.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/remumalefazavu.pdfIn PDF document text
    • http://computerdoki.hu/user/file/jipazotofup.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/2680010436.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/48154705798.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bifeforedofizawakubato.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/liwogalokowojosajuvaxaru.pdfIn PDF document text
    • http://junge-klassik.com/userfiles/file/33671825911.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/19531296636.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf1ca82010---xepivofebapaxod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6adca202b---rapatexuv.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd81472bd---25920757069.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/wodegagosof.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/7319489219.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/75690403952.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5010cc5f99---56895052612.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/tq9qgd646qked4b1qd1g0u20b5/zipuvujumawugejedol.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tmri81n5ssg9rtq85n8r8k6n33/pizolopeg.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 18060 bytes
SHA-256: 0d126899473d6ace89645ca16589ecb1d2728b5bb7cc01d90824807afe882d30
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 10704 bytes
SHA-256: a29fe0d2cf8d2968ed8201c3824d31ed12c2166ff7c1d1e388d3c4077677c77b

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