Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecb9f174a2bc912…

MALICIOUS

PDF

84.7 KB Created: 2021-07-23 07:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd29ac3e521b36478b9895880b1968ee SHA-1: a292c8ce270499775bd5c71175e10f96b40ed02a SHA-256: 8ecb9f174a2bc9127eb13b2e1006ec1b2783b8b0c7d86698179f5162a24ea942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://okuninka-biale.pl/userfiles/file/woxofovadagip.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d7c233336---23519770384.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3b57c3f3---tuzejefotupanulavelawume.pdfIn PDF document text
    • http://portableandcool.com/files/files/jesejiwasalatiwapowut.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f682ea0b6---73414946794.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2iup80nvvdb2jjq8rji0g3hi4/32870551457.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/kokulugawozadifivi.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/37937510791.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/negowoxefolasawula.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9391159b5a65eeef89bb6cd81e90819a/gajuxow.pdfIn PDF document text
    • http://robbes.nl/media/files/gerumakineribafinunodibo.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/31054368388.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c46ada596ce398fc1e8d577202734ba7/18223723755.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/texuzeragimowebod.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/relamegexuzakesot.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/zopuzawirofeme.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/3nr8fih7dfiq7mf7pc7d03r9pn/vivizufote.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/zirakep.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/bixorabakeparezo.pdfIn PDF document text
    • http://policylic.com/uploads/files/40340624587.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/vitogorot.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/33796532073.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4071b795---16382690315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=one+thing+remains+original+artistPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10580 bytes
SHA-256: 07cd5e739f9caa781e8bbeca5241e2fef568313c0f1ae424b9d03eaf0f1ba378
font_02_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 17756 bytes
SHA-256: cbd7c4a8e7b65a5b46fab59900b71e20becb32edb042e409e7b22ca7b49a8999
font_03_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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