Malicious PDF — malware analysis report

Static analysis result for SHA-256 1173b67da4de79de…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 18:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4b1222684e2a86e1e85574d9e74112f SHA-1: e8f34fe90f42ae3474e296b7b90a2572d9584ae6 SHA-256: 1173b67da4de79dea0aa8e4383572a6bf397e62fc26c80b78b93e55524e51b3b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure victims into visiting potentially harmful web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=find+roots+by+completing+the+square PDF link annotation
    • https://matharu.ae/userfiles/file/60130316422.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/sugifijamolobarewepe.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/16550877627.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c665436e3b---pajorareg.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/paludamiterixininekuwak.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d17e64810c9752eec92419d37773b0b1/57008275695.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915162520.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/tugolasijejezafisate.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf0acafa5---bakimitivupasobufajir.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/jeduveribogaxelukowir.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d992bc6f6c2dc3057273bc60216570c9/gugiwenajanu.pdfIn PDF document text
    • https://adikmanis.com/contents/files/sebufaxupikirewekuputeze.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/91915094280.pdfIn PDF document text
    • https://protrialse.eu/files/files/68451046696.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/dudiwigufuxiwokak.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/9962431938.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/jomebexojugoseza.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/bisebazixisirixivanedo.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/42103044000.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xidobiga.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210915202306.pdfIn PDF document text
    • http://domainecomps.com/documents/files/40637292001.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/84480050618.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lozepeluxu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B1 16784 bytes
SHA-256: 1e1eff290e1e8118c5d33b09d09f12dae2502d84d2cf44e14edd44898e56dec1
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 11440 bytes
SHA-256: a59947a035d3361fad03c92e65ef87d67b1d8e5d5caf6459d820abcdca0dc537