Malicious PDF — malware analysis report

Static analysis result for SHA-256 157f6d05e8f1342f…

MALICIOUS

PDF

95.7 KB Created: 2021-07-04 18:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d3a13a4351dac1f4b03419c01027e80f SHA-1: b33e189b7ad60a91349230e6af02f885c234f6f2 SHA-256: 157f6d05e8f1342fc8e15a0b7382d1928687447f6de98c7488f877ea3039fc88
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to redirect users to exploit kits. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=streaming+f1+spa PDF link annotation
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d6aea6765233389708cfc0f49c1ad37c/wijixolilizu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0cf735f3e---89971750998.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086963f90d0f---bazarinemofatu.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/25199343963.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077276f780dc---79422617622.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1201c090ab188267982fced71f237492/34262446826.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fadebifujixukevaru.pdfIn PDF document text
    • http://hasyo.net/files/file/47756499632.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/71964021576.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e361c459---labubawujagorexake.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16093159e9cbaf---garuxuxure.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/67088165607.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5j85ih53gshd3ut8s4an83ddq6/91462649774.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0a63c77164fab4477edbcb4d2e6e593e/62759150038.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa684848964---39693830213.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b926d5cf3---19892011069.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///50346979504.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5944f67e---rugevebuxewuwe.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a02f3ff46fb31c6244b681075d975326/55986034935.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/81175107567.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/87ojpdjul2gear20l478aip3k1/35418004882.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bd9255349ed70f5f91bc134f4c2eb40a/jofetusiruvufonirepepa.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/27521299329.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/getejepuvumulo.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/67563133198.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/dagexugaxinet.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_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 10660 bytes
SHA-256: e802eb61adb07195ff7718122af75f92fa31f9a09d69804b9cb2fa201fef5907
font_02_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 18452 bytes
SHA-256: 83f9f3f0540e3c98b8776fdaf3d71c48abab2df5e3783f6af2bfdb95ccead6a5

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