Malicious PDF — malware analysis report

Static analysis result for SHA-256 0668b4e09f5b246a…

MALICIOUS

PDF

82.2 KB Created: 2021-08-08 11:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc7c7e73f070e62dfa6142cbe964865f SHA-1: bddcf52dd7a2b8f4484826f826d5d2d7129580e9 SHA-256: 0668b4e09f5b246ad06bdce908e61f27a1939bd04be8a0399d378fb437a32d1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=is+there+a+season+3+of+thou+shalt+not+kill PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc9795b42---dewisarogidefevimopukorek.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/eeda3b53373c44adffe82c4dbc15141c/732473180.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/339c588940f6196f9562507127474952/xukufizinorewaluzuniw.pdfIn PDF document text
    • https://numberonerevolution.it/file/81790538476.pdfIn PDF document text
    • https://amgaa.org/temp//files/3715185076.pdfIn PDF document text
    • https://puppometalli.eu/file/65440020344.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/pubis.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/nepemubomivevuxunavuru.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/luxoguzagubava.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/be8d689cd2120ceb59be4a81af61d3e0/winigekored.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/28646037990.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3f3595cc---19977665580.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3b2c40a7b91fe389b70da51688d67189/dejaroz.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tomsmqn1qqdb3iks8a8a9m46ih/24428370119.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fe479626fdd---xopajilimarusiboga.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xubawurubupixexusitido.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/kasalawavapinofime.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kemikanovovujajimogasiz.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/powamivixo.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/7857946675.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/gugaluvagudakagezi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b364611f1---bewil.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/sukorawasepibeg.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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 17844 bytes
SHA-256: d14ecabfad1e7ec18e661ea715378ed92db8ea5757d1081b6a9b6ef163ad97a9
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 10624 bytes
SHA-256: 749ccc47873c0a1216a1063ed971d17bc9729121f7ac3d4ca8e05eed11c277ee

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