Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab66ec5306817732…

MALICIOUS

PDF

87.9 KB Created: 2021-07-05 21:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ce146c25fedd5aac66bfc1484e45bea SHA-1: 6013267e5fd8ff5d208199e8ae4c95b07b4fe8f9 SHA-256: ab66ec5306817732f673396f3371df104e067e38611f59a490deab97940237c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm, directing users to multiple external websites. Several of these URLs point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=fruits+that+contain+carbohydrates
    • https://suma.ca/upload/editor/file/vavobuxuxakedibikadigos.pdf
    • http://maszyny.pl/userfiles/file/19375392648.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbe2e8ee6c---96559722305.pdf
    • http://apsencollege.org/test/fckeditor/file/xumafapuxo.pdf
    • https://chpcentre.com/files/file/96684751486.pdf
    • http://falerisztika.hu/tmp/wofegutojiz.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f65ff0333---vutupa.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5372b152bf6fe4ac86f1122af146f160/15399431701.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4oti61u82p1u0rqgrdbjnrraj6/kidagujafusasegijoj.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace27b3e628---96524658073.pdf
    • http://blfimmobiliare.com/userfiles/files/direjetumigamanaxidawaxu.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb43a8a62---dunuxapebe.pdf
    • http://banghaija.com/userfiles/file/70678885836.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1626717988.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/1vkhfqnq8bn8m8es1j1cs5ojlu/6454851852.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160853154e0be6---58311177222.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/78914366046.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dabdbp3hsv9f7oq796s9stfm1q/nukimikexujinez.pdf
    • https://locoffice.ru/userfiles/file/linomuruwer.pdf
    • http://praconsulgroup.ru/pict/file/fuvujujamij.pdf
    • http://thepdaitruongphat.com/upload/ck/files/siten.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd21ea773---xidosefetamabagidex.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/samanodex.pdf
    • http://i-daa-wl.de/userfiles/91172143296.pdf
    • http://topcudental.com/img/userfiles/files/80065376633.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5e958385---wevupopupatojedazuwasax.pdf
    • 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_off0000f3c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
font_01_sfnt_off00010bdc.bin
b67435994ab052ab97ecc09e0c2c806c0c31c66ae7c0286d3163046d40067d68
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10752 bytes
font_02_sfnt_off0001248f.bin
d13dc2cd4a043623ec8d8648d613342ba21297e6fc80262c394154e0c44e2688
pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 16932 bytes