Malicious PDF — malware analysis report

Static analysis result for SHA-256 e831f6fe9e270464…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bc59aa1aee05a8bad518b4e5f9e4298 SHA-1: 68c9f19b610ffbf70175a5c957addd73d825151e SHA-256: e831f6fe9e270464af4c5bc2272834134c2dda5aa256452555f3b43cb6f5a6d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5957c41---luvaxagobujugigofi.pdf
    • http://frickcontrols.com/uploads/files/68554480713.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389866c3641---xizigizazadevaxuxuzuru.pdf
    • http://belgium-ex.com/images/blog/file/38953409137.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a913165e20---63810435811.pdf
    • https://zivotzaokny.eu/res/file/datuwiveravazitowit.pdf
    • https://spandoekland.nl/userfiles/file/kofavobanamadijowinopow.pdf
    • http://www.deco-interieure.com/userfiles/file/709823768.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/titoratekebowu.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/efd8b1675331d426be2c98e5522f7e0e/xivisegatuje.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/ligelefideza.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141124dc2c83---jokapakina.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/wenerit.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fab09c7696020ef3186553840d62eb60/lodebenuzolajidoramez.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402513332c8---silowewapufovo.pdf
    • http://whatcanidoforyou.eu/publish/file/busewitonoziwixuz.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6a26107116e8baab5284435ef4c90140/bagepuwavevitazubed.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0cd9730671de9d3812de7447fb04108b/ladilogokure.pdf
    • http://ayhancevik.com/images_upload/files/46525530276.pdf
    • http://dywin.com/uploadfile/files/34125036359.pdf
    • https://badrivishal.com/media/16091957325.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141316f903a1---16954058322.pdf
    • https://digireg.cz/upload/88437626110.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=beginning+android+game+source+code
    • 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_off0000cda6.bin
231266644abfc1be22c6a66e6719cde7a3ce0da621d98799f6c26d44c205ab48
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 19060 bytes
font_01_sfnt_off0000ff85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes
font_02_sfnt_off0001179c.bin
8910ab2af7c7cf8150d4cbd97814ccfa196202c91502e8fab5a3fc11d69a2fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 10720 bytes