Malicious PDF — malware analysis report

Static analysis result for SHA-256 2703e047dadbdb5d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 18:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf53680b9de56e8d34cf4e6ac5404471 SHA-1: ea1c2ef08ca4212268e7cbd6315f4a62ce8dca40 SHA-256: 2703e047dadbdb5d0e72ed669a43a5134d8f0f46467a44492408599943a8816e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://senesi-sklad.cz/userfiles/file/41731107469.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5hd39fm8aepr6v0mjn5gc2qe02/6891816185.pdf
    • http://ottomaniantextile.com/userfiles/file/jagitirisemibejifu.pdf
    • http://x-mobio.com/upload/files/gixax.pdf
    • http://chinamakina.com/userfiles/file/dapegugebodilalujek.pdf
    • http://novafish.it/userfiles/files/244583487.pdf
    • http://sualpturizm.com/userfiles/file/8517555791.pdf
    • https://letstravelforacause.com/miet/assets/files/dezedapukajuk.pdf
    • http://polipack.ru/content/file/jeginupawamowaludujozoru.pdf
    • http://ztracenaexistence.cz/files/content/file/nozema.pdf
    • http://tuzy.pl/Upload/file/41937978712.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/38071700672.pdf
    • http://www.jysunshine-hotel.com/up_files/file/doguvesezed.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/876b58805a2613462539b0fa610dcb16/gegejapa.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/kutul.pdf
    • http://meadescafe.com/userfiles/file/sodupurizobagavex.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/zanukulepogefewokewis.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/rejadatoligekipu.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142253a4a3c3---63960118451.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343667e768a---rezipiki.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ighu6ef5rnahctkjkh7ng4cchq/peturepuwefumixove.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/824557000614b008fbb679.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cam+tavanlar+english+subtitles
    • 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_off0000c5fc.bin
8b036718e40fd8f91a8cf9e35d28720b6a9051a7d0a43fc03d0b5e7c7589a453
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 10772 bytes
font_01_sfnt_off0000de92.bin
b2d2f4a70c14f4aea95ca498a300f2e1331f299d028e5ae81f5daf59ed36f802
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 19480 bytes
font_02_sfnt_off000111a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes