Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb20d9996b637a20…

MALICIOUS

PDF

75.5 KB Created: 2021-06-26 19:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0fcd1901d59deff7d0715f2b2f9709d SHA-1: f7b0cd557f66c931784ceeea7631bdcd8bf02e4a SHA-256: cb20d9996b637a2057c0292882144c9c630bc569ae7fd65517ce2ca1b3d952aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ruusdcamfh7kq3d3tp0vks5rn2/biwugutojuzuxedawepefa.pdf
    • http://dieta-plus.pl/userfiles/file/6346408429.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8296da1bdceb2c00b1859188abb4630a/texerulixesu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d87e439fd---33786431524.pdf
    • http://xiaohecollege.com/d/files/54484639371.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4137634bd2a67aec1506c8c8b71826aa/95736693620.pdf
    • http://medicaldistri.com/ckfinder_files/files/81544777343.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/cbd75de84c1f7ca8b00008ad13fd4ba4/31114829103.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad7dbd66f9---poseperufalazexixix.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d20eccf0d31f7db5ff3beb5d66767c9f/46371573942.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e391bb6518f5f009b16f6ca7f11b04f6/57250728566.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4f48fe9d186fa2e826676c55cef39f86/xilajuradoxamufawofozu.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210601_2E0FADDC132EF5FB.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a460e624e74---67159033191.pdf
    • http://anvlaw.com/userfiles/file/53095201918.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbfe989b5---57636393738.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/hf66nv9cifdfjmst17o4s3i0m0/nawesume.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zusiruzeke.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c02cf84a07d4e0f8b16f2a425e3606e3/78551571303.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6bdf58a76---97330926167.pdf
    • http://centreforeffectivecoaching.com/media/file/gudowo.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dibutepotosikejeragogu.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/48c940929ca4c0ed078e8a17380fd4ac/47239150938.pdf
    • https://ludifrance.fr/userfiles/file/10573978705.pdf
    • https://sportsht.com/userfiles/file/16924950640.pdf
    • http://boxethai38.com/upload/file/86782690123.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=questions+for+there+will+come+soft+rains
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c422.bin
4615356bd92a5295d95c82974d3bdb75b08ee64f26c224e67cc762ab8a748bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 16412 bytes
font_01_sfnt_off0000edc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16792 bytes
font_02_sfnt_off000105d7.bin
93f058769e0a42fa299021b521d33792e05fa126bec268a580233978291952ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 10848 bytes