Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3da4dcc791a021…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 07:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47af1a6c2ecf667095eabfc0941d7506 SHA-1: f73a097befdfa1e2350073e9fdc55078662c6da2 SHA-256: 7a3da4dcc791a021745373cae8a47b6e0ff241927d811fcc1cf819403606bbe0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including one pointing to a compromised WordPress upload directory, strongly suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://fabrikando.com/cmsimple/images/file/teburonuroxomujebukeru.pdf
    • http://vers-ma.de/userfiles/file/55816567238.pdf
    • https://batikatravels.com/userfiles/file/fawotivuw.pdf
    • https://dpt-mh.com/uploads/news/files/tikonivifewuvisiliwuma.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/9361400202.pdf
    • https://et-auditing.com/userfiles/files/jikumevanema.pdf
    • http://huucodatlanh.com/userfiles/file/rafad.pdf
    • http://tiszaladany.hu/upload/file/zodezifubixefisinev.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2k9a9n79enpsk8mbff1v8gg0l5/mizedofugurofaka.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/valafebevagixutax.pdf
    • http://www.almansori-ye.com/almansorifiles/files/16234425339.pdf
    • https://thuhuonglacquer.com/uploads/news_file/93844958046.pdf
    • http://sovaimm.it/userfiles/files/vivipox.pdf
    • http://manpukuorder.com/uploads/files/posowovapalelot.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/3919540772.pdf
    • http://www.peretprod.ro/content-images/file/papoxenoxomiwawokukaluw.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b1f908fd4797ab5332f6ad872739be41/tonuwu.pdf
    • https://ustunbilgisayar.com/userfiles/files/gerijaniwoxolovaf.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/20100685242.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c4e897aa8559ce6fdb03ac499a510c49/werinimiwavusotujevab.pdf
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/nijinofejewasuvusanik.pdf
    • http://timocomputer.cz/files/file/bemaro.pdf
    • http://liluby.com/upload/file/67910098648.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bbq+franchise+cost
    • 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_off0000ae42.bin
86fbcaf87b282f95f269b2fcee8db9fc774d601e8121c7c2d13e17accf756b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 14984 bytes
font_01_sfnt_off0000d3fe.bin
351dd92974b7be68c921969f7e94d9fb70b4bf9a7cc9f97fb788c03b4fa22b21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 10728 bytes
font_02_sfnt_off0000eca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes