Malicious PDF — malware analysis report

Static analysis result for SHA-256 8727df7ec788c629…

MALICIOUS

PDF

80.4 KB Created: 2021-10-03 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06f2c2ad20e2f38d4855b1b0e9385933 SHA-1: f3ecd0bcd26a0fcd63230b28ea592272a6a4ae9f SHA-256: 8727df7ec788c6293c2516ec2792d66e51d0df8460c11800b05604983d45a6fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://precedent.by/_newsite/images_from_html_editor/file/janasaxegobalorepokogeza.pdf
    • http://schokoladenfontaene.de/idata/pumerixowuziwet.pdf
    • http://chelseafoodmart.com/uploads/files/vuwew.pdf
    • http://strandedtattoo.info/file/vogijol.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/sipud.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/61b6e7041f73e2b39882df620b9fd2d2/pazafunef.pdf
    • http://jacsonsfurniture.com/userfiles/file/rolekisanufebaxepuno.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137df8c74496---86117926812.pdf
    • https://people11people.gr/uploads/File/juwopogevogozujelifuvox.pdf
    • http://ahnil.com/userData/board/file/61970596263.pdf
    • http://sinners-party.de/media/file/melekixawibogubagagevuga.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3678ea200---74567022785.pdf
    • http://thy-environment.com/userfiles/files/wuloja.pdf
    • https://firsatoyun.com/calisma2/files/uploads/sufovibizuvabuwobokewonid.pdf
    • http://asbufestival.com/uploads/FCK_files/file/kepoduxutuwunavo.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/52916976126.pdf
    • https://vildmarksjagt.dk/userfiles/file/bamuxaku.pdf
    • http://adfaveo.com/image/files/20210920_103810.pdf
    • http://only-svet.ru/upload/files/26718809343.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/bematobexijojiz.pdf
    • http://guitarenko.fr/img/files/nofofelevugenojewidudovij.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/5675940138.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e98c941fd---bewodenoxulobose.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vocabulary+workshop+level+b+unit+5+choosing+the+right+word
    • 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_off0000d097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16792 bytes
font_01_sfnt_off0000e8a9.bin
e61aba16a008d13062d1112e7cb66de7e0c1ef5fae2d01506b6eee9de0b50b22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 18556 bytes
font_02_sfnt_off000118c3.bin
d185e948ef51f1287b46b5e4580f32013d6e8a538f0507ece1737e435838a2aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 11496 bytes