Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1b0c90d1b18c57…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 00:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ff0a031c57ac1e45852b99c485a0a47 SHA-1: 9378efb11432d0c0318f2c98276345fc95720ae5 SHA-256: 5c1b0c90d1b18c575a514146446d5085da669911e03dc88203b02cf0546f694a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The presence of embedded JavaScript further suggests potential for malicious scripting execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7af75a553c00c75a969f7589be65cc3c/40353478176.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b46e33bf---10811730443.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e52420195---16713356288.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1f1707c8108c3aeaf2bb4292dd9b3f64/juxuxuduni.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/fijikerijetew.pdf
    • http://sistersaviopublicschool.com/userfiles/file/zekajivazajazafolo.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/23ul7egsrhunirsjsno8o42sae/75300558708.pdf
    • http://altelaw.com/uploads/image/file/rumitixubafadapirutalake.pdf
    • http://carnow.jp/js/upload/files/814278965.pdf
    • https://digireg.cn/upload/goweroperu.pdf
    • http://thienthaopc.com/upload/FCK/file/69356140565.pdf
    • http://urgentcarepb.com/userfiles/file/rabarumajuxisomumow.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607070c4db727---30466313945.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/zuwizote.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a438e0716c7729110d19bd7f9b789f11/33669512014.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094329bb1cf7---sixajopabiti.pdf
    • http://tdbakademi.org/userfiles/files/84902097466.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084614698748---15885281213.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1023e00f---lerogevaxinizo.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d7d4b4992fe9194f3039c0e6dc052d56/wetidejosonogotabelipip.pdf
    • http://madmojo.com/fckupload/file/35975734360.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/49066076624.pdf
    • http://reginahajo.hu/_user/file/damur.pdf
    • https://sasalidayanisma.org/uploads/file/rudurima.pdf
    • http://modnyi-buket.ru/uploads/files/lexirowadopib.pdf
    • http://abwingsbuffalo.com/uploads/files/91764591561.pdf
    • https://defaico.com/d/files/vevazirefaxexomobanogot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hosta+plants+and+dogs
    • 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_off0000f76c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
font_01_sfnt_off00010f7e.bin
165edd3016158f4e6375994479e6f3ffbcb12872176f1349c817d9bb08eaba72
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 18476 bytes
font_02_sfnt_off00013f49.bin
8a1a531cf382cd07bac30de06b95320ae24dc587142ecf5efc8c140ceedf0d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10236 bytes