Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53a96460d16c28d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 10:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ed2ba66bcfd60418cb0db18d561d85d8 SHA-1: 736d5c1f5b40e3c6949f2b5c75ec48173f9c2273 SHA-256: b53a96460d16c28de07147c70c557102a7c9543fbd683d155e3ef695b739be3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the PDF is designed to host a large number of links, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=hunger+games+catching+fire+download PDF link annotation
    • https://damsindia.org/admin/uploads/file/51776511327.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64acc7816---jonizikipudujagarufawibo.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/42093155839.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/61368091768.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b7klceemb9ple3td3hs2cmni08/xigela.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506181432.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/83895407441.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/23758886279.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/13584a2a8e3898ad10a06fd2e27d7f95/32201452339.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/fuborovujetore.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210701_105246_9137.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pidutetetopi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65aa4aa61---49955519364.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/aedab9eaec207e347ee0eadf3e32064e/zadarusudojalovuwimaxova.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562518dbbe---kezoworew.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c947e0b41---22935899487.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/246b8f09169e802f9dd7a578af2d3a0d/11564188886.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/947836d04636296dee322006626d2b2e/zifexazazajaratex.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7d1542f8---xopepamojipawa.pdfIn PDF document text
    • http://le383.com/uploads/files/jekivaxigaposevefavined.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a96c3bc60---5657646095.pdfIn PDF document text
    • http://scro.ru/pic/file/rebozojariwozeresuzuwat.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609794d0629c5---buxenerexadenibimas.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/sudupidalulibil.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fae6d4fe6---kewebuvezakafukuri.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/12609609042.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5e9044b0---vesilabotewij.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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 11100 bytes
SHA-256: 82ff28b553ca70dff542b35c932d75e8403befe0132609e32b63dbebf9222832
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 17272 bytes
SHA-256: 747bae85af162e20fb3b359170da570f636dfffae43b22a4417ff39ca767f42c
font_02_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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