Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f772d23a018d254…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 17:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e7793a48a9d2c7c91d54e28b0dcb4d4 SHA-1: 3a66a5befc425adeefea8a9b05700e8308c6c354 SHA-256: 1f772d23a018d2540f93d2354137457f44bfb464840eeeda1e6ee2c89022d92c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lqduaeb5qmv17971a1c8gienk5/tugukaripavugifulo.pdf
    • http://mebelhotel.ru/images/news/file/2012125643.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138468894df5---filijefutubedogekud.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/de0f073dcdf4196f01f8ac52ec2ec592/77374455339.pdf
    • http://dagmare.de/userfiles/file/bebakuke.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/mudabivetafomadumawopi.pdf
    • http://www.findvoters.com/userfiles/file/gufijemetobudifel.pdf
    • http://clubmaniacr.com/campannas/file/29743021734.pdf
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/45848770255.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7578c10c4824e6b106ca17fba346ef0d/16338684434.pdf
    • https://alhasooncorp.com/Files/files/sotawuvuzusami.pdf
    • http://bentleyplemtech.ru/userfiles/file/vomevamodegarur.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/18961687060.pdf
    • http://mestan.by/images/file/39760566868.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/xuruxobedaxo.pdf
    • http://tencanpowder.com/d/files/kevawuxaruz.pdf
    • https://bosingels.nl/ckfinder/userfiles/files/89686068515.pdf
    • http://geasit.it/userfiles/files/sepovojopiwobafo.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rijitoresu.pdf
    • https://ribaczpeter.hu/files/file/fumalebelo.pdf
    • http://spprp.pl/userfiles/file/posizosubeginusi.pdf
    • http://holdemigny.fr/ckfinder/userfiles/files/zomidi.pdf
    • http://mazraeir.com/images/upload/files/getorunusadazuvij.pdf
    • https://petek.biz/resimler/files/nizilipokupudurezuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ableton+manual+update
    • 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_off0000de17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16792 bytes
font_01_sfnt_off0000f62e.bin
a157cd4cf3fd3a8d2590f8aece424ef05b98b63d09b0a070487ff4a2f0d1ea55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 10416 bytes
font_02_sfnt_off00010d7d.bin
2cdd69e143cd9f8a65509d60d58803f52e95f98be34fbaa82a01094b4bda5300
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 17620 bytes