Malicious PDF — malware analysis report

Static analysis result for SHA-256 a621b4c59d61e16a…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 00:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb248fd533725a192edf11e48b446b39 SHA-1: 22942e7d3fac0cc30866410a9d7bc6b61e1b0334 SHA-256: a621b4c59d61e16ab2ebc3a520d074eb6a571b5894b320120d01c054eedff006
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160786d42de492---32931457164.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/24fb2fff7f2bb3bb65acd67d9b53cb35/18339274706.pdf
    • https://migger.dk/userimages/file/tojawuminovukibo.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3844402398bf117906e135e424785800/32291292926.pdf
    • http://aplus.to/userfiles/file/22850776088.pdf
    • https://kompaspt1.com/contents//files/69765080259.pdf
    • http://michellesmithscott.com/clients/36670/File/10201629219.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e4eda44d---54049640631.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/podidof.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb482d1c075---20880544437.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3f38e55d02bdda307ee8e63de601ebb/83838752273.pdf
    • https://susta.vn/userfiles/file/salivaxalutujepijeporagot.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/sednt6fp321q53t2i8h9sj6b5p/sopimujifakavagupesaripa.pdf
    • https://urbanlivin.lu/userfiles/files/86021403613.pdf
    • http://canigrup.com/userfiles/file/56309869000.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984835713f0---sonowozezofisojuzuvikibif.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/50906148719.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71a40aa6f---14852401701.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9cac3832---41104794309.pdf
    • http://kidsjeodo.com/images/files/69191303801.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e42a006d5---nejasojejowasonotuvigoku.pdf
    • https://monyetmesum.com/contents//files/ruguvirurirogase.pdf
    • http://domholidays.com/userfiles/file/wudozipokokotuwob.pdf
    • http://forter.vn/hinhanh/file/rinod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=agil+model+in+software+engineering
    • 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_off0000ebd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
font_01_sfnt_off000103eb.bin
c9ec124d8963e6e6123f7008c6a4dea6f3d2f4a90cd8d250e5e6c07b8c0eb32a
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 10764 bytes
font_02_sfnt_off00011c86.bin
cfc082d6d6f755a7ffe631f9ee9e17c2520119d5de8b374807ce4d57f73ee490
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 16816 bytes