Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68604f5e794ec9f…

MALICIOUS

PDF

125.8 KB Created: 2021-07-21 04:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef76e892f630faa8cda9e6e26c937e1 SHA-1: 3a4b4202d1ccde7e9a080fd14b1cb17d32b8bdc5 SHA-256: d68604f5e794ec9fb643e49c987846a7f5ba20a7799cf21aa1218e9447e7174c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 7

  • 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.
  • 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.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/795ln0ef60cp6sbuobrvtsop42/devenesefipufozaxet.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ae39e0a9---5911063744.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607378f279170---zepanojasanatuba.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/7119788223.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20a171ed9---29424245145.pdf
    • http://goldnumber.info/userfiles/file/joxipukagatusup.pdf
    • http://mywymc.com/userfiles/file/82278719658.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/93477240546.pdf
    • https://agrilaui.com/userfiles/file/32779660970.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea5f0aa036e290a00fa537959712d397/bawapesusokukuxan.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cidve41mt68be17qtgvtj1j366/16231987525.pdf
    • http://www.allatpatikapecs.hu/images/file/5443393659.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c5369733---radem.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91f23674d---lixeginirovumevuziragis.pdf
    • http://bjsprt.com/uploadfile/file///2021060911081131.pdf
    • https://easybuildapp.com/files/uploaded/files/vikifusunulorikaviwevaka.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e443fdd9---lelosixiwesujigomobes.pdf
    • http://shuswapladystriders.ca/userfiles/file/vebafereviz.pdf
    • http://dailymaytrogiang.com/userfiles/files/fefafulibadopufa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/01a23cd2d1a1343c6494eabaa94f2b44/xujivuwin.pdf
    • http://agataklimowska.pl/userfiles/file/7974117100.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/npp31v0jhp125jjpn0raoqaj37/jifaxasigafojejetugi.pdf
    • https://etonbio.com/newsLetters/images/file/vopipibotabanapozol.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/fuzuvijuwisup.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e136e395222---sagowapapag.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a7633b4e8---sodupoxipoludiniw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nearest+launderette+to+my+location
    • 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_off00018e70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E70 16792 bytes
font_01_sfnt_off0001a682.bin
c5d959796a69010c86170a92f5f97317aa9444e9def4671cbb47c0958cfdb589
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A682 16328 bytes
font_02_sfnt_off0001d0e0.bin
d703b5b18f1bc9daecf80dab8c8d79437735db2528a381920aa63740e3463338
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0E0 10720 bytes