Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f043769ce8d8490…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 19:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a37a98f16e9d861dd2073ae55677952 SHA-1: de5b32446ab83f7347be9a84411a25ea869ae337 SHA-256: 1f043769ce8d8490b3314139e8db2c16dec7d45677241dfc5008655b42ae46a3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. These links likely lead to phishing sites or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=charitable+deductions+cares+act PDF link annotation
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/54345413862.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/28474093651.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hcijjit9d0oajc24ecm28e6cg3/92858558148.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xozokakujifefesadojatipev.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/27270168158.pdfIn PDF document text
    • https://proia.bg/userfiles/file/10671479922.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/suligigularinolowu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3df310a4f4---63979522241.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210704035135_bsep0u.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e75b43413b0e5293787d9cada161214f/pasekuminawulin.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210624051124_815586643.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/62856159143.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/zetabumo.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7bba024df49b4fc7fd3b29d74881e03a/vejalozafepozelurewizub.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/aee1140c09487a5807dd9e2c350bed18/45756039256.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/wolajofomutag.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa506505f84---zoxagasijil.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/14907256416.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aca01aa727d---nipipugolox.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8ukme7neivotdb6v7qfpb4o33a/lizumava.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781b11c1402---xukebobovomugivel.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f3269adb20d---89988618796.pdfIn PDF document text
    • https://chpcentre.com/files/file/7029860518.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/98jm2fork6hq2jrv9ni4c38r2v/35650780478.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/30621264136.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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 17064 bytes
SHA-256: 07fbde2ebad1ff022b753dbbc8aaf181ed3df93c4c62d43d66751e76f2a93cb0
font_01_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 10736 bytes
SHA-256: ba79d813da4ee2b9dd68b51a2fcd4488f7cd136c681d091d9e566c745ef39adc

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