Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62a0f4594663e96…

MALICIOUS

PDF

98.7 KB Created: 2021-09-04 03:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e92157a921837e32256b0453e10243b SHA-1: 0ca9c1b311327c3aa58ea10166b49e1e41d4c897 SHA-256: b62a0f4594663e9610144140c514df5f5e9e81952157c37ebef635aff64a677e
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is unreadable, but the heuristics and URL analysis suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://accesoriosalmayor.com/images/userfiles/file/vizelarotesamapowugi.pdf In PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/88835601365.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/fidabakajirudamefoli.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/61077624332.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a45562db15b---30932751066.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16105bfa8b8513---suxurowobolevironawise.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wijakaxagugawusad.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hvhd0be3uv4ck489uiltpq0sok/48303271520.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6975d0c3d35eeae52ae6ed5496020140/vumegogunofovi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa72bee4bb3---78202599285.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de255af08a---fugeful.pdfIn PDF document text
    • http://hrudolf.com/userfiles/57214370952.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eiubj3amt3qkm4qqt361nha27n/lejezakasem.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6da45a11c4f78e28c141ea7a1c964315/42192174132.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/65161207484.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/58331118130.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/74evdcrqgthbp79gl9ddh5kqv9/83329195955.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/67868580193.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/jowatakot.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/womoxulanaluwif.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/80070771117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=monthly+current+affairs+pdf+in+tamil+winmeenPDF 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_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 19700 bytes
SHA-256: 009742639a7987b7c7015bebb576558eb4b5ed1d937a486b142952ca8afd90d8
font_02_sfnt_off000162da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DA 11176 bytes
SHA-256: b5171d09a6afb71d15b2ba2deaf6740b0b8982b3ce20baeb4591e07b77511f91

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