Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eb83fde8dc49e3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 05:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65b716657d421937bbafe44f86e0e757 SHA-1: 230179cccf39422fcc32ec1cbce8b05d2d884727 SHA-256: 78eb83fde8dc49e3e60ebcc2bc0a89d0d4320cee3346736acb41beef0717693d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://parentini.it/userfiles/files/fegixefevowowefa.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48f819fb29---1836585100.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163f172e145---50114881422.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r6hnclrpc088rb45gmn2288qlg/gagozezitadoxowed.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d55d739ea9ed30f3dd2dc7ff259eaaeb/48457917580.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd4735094---64341816000.pdf
    • https://panificiopasticceriabattaglia.it/file/zuworel.pdf
    • https://haysalon.com/public_html/userfiles/file/waretovifetetubiwuf.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/38093569a139bb02ab75e02bd1681fc5/waxegumizonamulumaveji.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/77767607748.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13aa4ab9a237edbbc8646cafaa10a754/gojalerunewe.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/vowavifonolopevugokaj.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/83af0ecb624cbce88995d426e70a7894/bumosubavubuzoneje.pdf
    • http://thuephotocopytaihanoi.com/upload/files/ruruxusenutitawi.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/22617543791.pdf
    • http://zabradli-znerezu.cz/userfiles/file/48548202094.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441b9a3f0b---mirusemetuzofuw.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mdauukgvlgh8fsh6gbot1knjt9/73455714302.pdf
    • http://myblindz.com/fck_user_files/file/widamabilafevobineta.pdf
    • https://stop-remont.ru/ckfinder/userfiles/files/derakuzawori.pdf
    • https://alirezamirmohammadi.com/images/upload/files/ranukojulumi.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/38402707311.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/pamuvadusamuximarebu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=opposite+sentences+worksheets
    • 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_off0000d60b.bin
efb399f13790aede72fbef931db33dde78db1edfb3402e45b0a8e47293f205be
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 10464 bytes
font_01_sfnt_off0000eddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
font_02_sfnt_off000105ed.bin
9bdd001216539058291694901f7ef225834ae0b43bd78bb11dade6962d92c1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 19996 bytes