Malicious PDF — malware analysis report

Static analysis result for SHA-256 f638aaac62e1cfbf…

MALICIOUS

PDF

90.9 KB Created: 2021-08-05 00:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70e5dd5f2439867d7146472b40a21122 SHA-1: 8053ab9019b1150bf604b59717f0697d5969571f SHA-256: f638aaac62e1cfbf7d206e125d9400902b9f13d7ee35105d1a257c3b4c854f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=cek+toko+sebelah+full+movie+download PDF link annotation
    • http://werkkledingverkoop.nl/images/docman/files/dalag.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f1f0a07b8474db6e4afa1a774b026497/1771775403.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/libigimemefulitok.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f223b7f5---83192341941.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502063427533231.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/43390604003.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160804a68f0fb9---46523374016.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6fc8fe6dd794ab4fd6d114a3a481cae6/24174245858.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/38968678434.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35ac0e458cf44a23aef36f6e6402c075/vawepag.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/79512396784.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b36010c0---xoxekivipanapefosuw.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9fbb4fa1---12712830918.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sja73k88bvmlumii48vd3v3pij/81260372937.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/benusiti.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/78378897230.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/zabokidalexidepagexepuz.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad439e9c47---37476948502.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/mewitimugodajezixinojo.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/fufewigajukosobatozozagam.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2l6h2lqspfjphjqcgb63gqlias/rimufum.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/givuwajonun.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/91507124022.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef334a1c6---lijukexoxefipulonagimitap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16820 bytes
SHA-256: c53478d6a9847417373d246c928bbda45c93778b211f8c7c4d4d0749e8121463
font_01_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 11036 bytes
SHA-256: df89dac87d8fadcbe3931cb170e4772cc67eec46bd87eb0be0f78b106ec5204a
font_03_sfnt_off0001530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530F 2248 bytes
SHA-256: 66561d23f2eb1695a39bb9f88b80d9683298b042bd99b179776941a2f3878adb

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