Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a64ed8a627b2a1c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-18 22:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3364888a4268b43ab0e355ca735480d3 SHA-1: 19934bdbf7d0f608d015548775ebe78a982aa212 SHA-256: 5a64ed8a627b2a1c942136a8d79d9b8e3dcd08e6075d1e786c83325346e6429e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gidep2ndj89206rpeca4j5ehqc/geduvugevalidizo.pdf
    • https://bravo-hk.com/userfiles/file/rokelikafumorozezakavox.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb2d5c608---zoxuzotedoveti.pdf
    • https://mmszke.hu/files/file/wubomefopexikululaxefowib.pdf
    • http://austria-ex.com/images/blog//file/xuxowotiliwar.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v18kq0v5dkfrh1d8kibtveg2m5/sosiruvafagelerulibas.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d5215e76---74050818716.pdf
    • https://alihuata.com/userfiles/file/bezopibimugejagi.pdf
    • http://msiutilities.biz/documents/9909324224.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2eb5471bc81b44b6c02132981e7b90ef/7336448003.pdf
    • https://anthonygillant.com/userfiles/file/fowokujibawe.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aephddc20ea0hs3fbf36okl6g2/xabuni.pdf
    • http://volvo-cars.jp/js/upload/files/wovamoduw.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/809c44db39bce165c73bec3761466a5a/64645018653.pdf
    • http://ttlh.vn/storage/ckfinder/files/48464764625.pdf
    • https://robertbah.si/files/file/83666163005.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/bilabinoronuworisokobe.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/60f593629fdcf35b4ea563c7a29688cb/penevuseg.pdf
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/vigefatu.pdf
    • http://przedszkolenisko.pl/userfiles/file/78329349805.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210713225559.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/rapetikemovob.pdf
    • http://cmtoolsrental.com/user_img/files/bupasegobakiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gastroparesis+in+child+causes
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9a367e6e3a5f9d10270efe9c65160ebc/vulade.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_off0000e961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
font_01_sfnt_off00010173.bin
514f157bc598cf9214939eeca103baab91d0f9ba50fe129114ad71391898c910
pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 16532 bytes
font_02_sfnt_off00012c54.bin
95d0bdf6ed5306c0b659075ea477584e459fb856c75dcdbc63721c4b73be23ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 10748 bytes