Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90d5f30b25a4c5d…

MALICIOUS

PDF

81.6 KB Created: 2021-06-27 20:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5225014d6df2134740fb7b80813b2fb2 SHA-1: 4d3f43ae0cde0e7f0a211a47cb6ff0a0255a07a0 SHA-256: c90d5f30b25a4c5d47aac997bbb8c1a194a906282db042a40b456c1ed1f70a6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tbuc8pe2jkclpie3s8u14g4it9/vokegafigewofevemokaf.pdf
    • http://jrmhandling.nl/upload/file/24768700416.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/887821356.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ev0d1t2a3ihdd22on7agl96jf/20293495989.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75fce6ff0---julopujogigu.pdf
    • http://hzjksj.com/images/upload/File/75140213426.pdf
    • http://aliceinformaticasrl.com/user/pages/lexate.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/pidatekali.pdf
    • https://palcev.ru/userfiles/file/xudezumazi.pdf
    • http://ajtoablakcentrum.com/_user/file/13945298039.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e63084d72---21373251098.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/28229725418.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/68a3b5bfa4727773ee45821f887dd022/wedufekaxeniwitemalonej.pdf
    • http://nextgenship.net/upload/file/20210527162212386116.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mkdthpcki61gdes6sm7p6qqr35/fapepimupabofixal.pdf
    • http://londonjip.com/userData/board/file/fugasugabeju.pdf
    • http://mosjob.ru/images/file/94895539827.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed29180c70dde782b584e21cf21feff7/45220213566.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1912915db7a26b6b3cf5517970000ea7/17377404296.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082007f41025---xosonuba.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072211ef1a14---piteboneridezexewi.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74291735670.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/df759ae54d7d26d96897e0e6a56dc454/baneladagoxud.pdf
    • http://americanewbie.com/userfiles/file/18936679743.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/64bbd072e6da9e7cceedd9655d83034a/58947638470.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f89741df---xupurazutefuxigejer.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=newton%27s+first+law+in+motion
    • 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_off0000de82.bin
264381a0b73c94de210b46b0162a65bb285d5eea4c1235389df6b2f6645da2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 15968 bytes
font_01_sfnt_off00010798.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
font_02_sfnt_off00011faf.bin
a42efa8ab24412a8c605c0037951dd7f71492944a4a3574ae56a6a322051cf28
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 10472 bytes