Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b62b49ee49f203…

MALICIOUS

PDF

88.0 KB Created: 2021-07-14 07:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 498c63152bf567b322b638e0437ad6ed SHA-1: 6aa4330af8e57a830859e558cb4c07a5ece334f3 SHA-256: 88b62b49ee49f203b704df89fd5b7eb7ac0d9da36eb460354da71c2882438d53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to drive traffic to potentially malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/26787966ea1bb260b05f2a4219c56ab3/dotujegabef.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab7474169---pejexoj.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pipojejepotu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/bdb5461fc78a0e2c2d4283434077223e/bisubilaxo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf219292d6---40837232408.pdfIn PDF document text
    • https://avela.md/userfiles/file/85057882466.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/vililat.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/10740628118.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/597d00cd6e920f78aaa4c490541a6db0/34488791650.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/32405992092.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/905jrmfg4udq81ovbg7ub6ahj4/67731706566.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/movolepiripixonaju.pdfIn PDF document text
    • https://htchninc.com/d/files/96629727005.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/demekenawigovalopumazi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/185850a8070fdb2692deedd862d4db77/19134248931.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/9066396348.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/84osg2muvgpb4atf3i6kerun4n/60126308464.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4f839e23ce25295913cc487e1acb91c8/37262152334.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/ranokutubukilovap.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mokoxewivasasi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3b17988684cdd2863ad0646e252e8057/96723413575.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/seditujem.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/wepetejisuresezabopapox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=formal+email+greetings+in+englishPDF 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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 17084 bytes
SHA-256: 06a677127f3516c3cd59c6e2956a6654e19c2ce205b81d2271e35d3b51b83fe3
font_02_sfnt_off00013ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD4 10532 bytes
SHA-256: 3290677857e7638f9911f561a7cd44b1846bc881a0f79d38a62a0ca84de091b6

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