PDF malware analysis — malicious · fac4573d1f490b82

MALICIOUS

PDF

80.7 KB Created: 2021-07-01 00:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 937f6e8223dc81c005fd32d59512800c SHA-1: 5d657ebbfb6d9c4a172dcdefbd74a9033e4f05e8 SHA-256: fac4573d1f490b82cd3da6184f31cae81f61df8f9e89fab0d7edb132a0d88061

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories, forming a link farm. The presence of urgency language suggests a phishing or scam attempt. The document's primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb720068b1e---7430997703.pdf In PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55c9e67c5---41278943828.pdfIn PDF document text
- http://flatadministration.com/uploades/fckeditorfile/jakone.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b824a53835661318ceee7b6549c24ffe/tedomojudaj.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7008e22e1---tulanezo.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/63fff9e7f30a3671c88d1e18aa8f3db6/sidisatexiwemawukitopitap.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3d814949424682a61512cea0d3e2157a/tuvojiz.pdfIn PDF document text
- http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bapusagamafavefuritemu.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/g1mr7769ecd27606medj79e7ul/rudogexuvimevu.pdfIn PDF document text
- http://dui-antidote.com/images/userfiles/file/suxozoladepa.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c684175d7c---29389083589.pdfIn PDF document text
- http://lamachine.nl/userfiles/file/fudapalewafukakibiku.pdfIn PDF document text
- https://oddluzanie.net/userfiles/file/9320307494.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e292b894---10915016285.pdfIn PDF document text
- https://baobihungphu.com/media/ftp/file/jenifemedovevukogevet.pdfIn PDF document text
- http://avanti-kuhni.ru/upload/files/50024699082.pdfIn PDF document text
- https://diaochue.vn/userfiles/file/39374246803.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c582a65b4---sulovibokujiw.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210628122652.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pbu35nbhkftjqejrr9ep1da6nu/filipujeterox.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0343eb0bde40122c4679b132751412ad/wujebituvasomitoxijaf.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4211c6bb---xomijewewono.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/198f049c5be932888ed892c45c5d6568/kevowu.pdfIn PDF document text
- https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/4cc0060625c5480164d9fa8b6cdda05f/52044599084.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad122a4e80---jejobul.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=contests+and+sweepstakes+ending+soonPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d546.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD546	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED5D	10628 bytes
SHA-256: `7b12c8ff0123bf575b6168d1dfa2aebfd58d200a8af5fdef7714283fb32f5b57`
`font_02_sfnt_off000105b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105B9	17440 bytes
SHA-256: `0dfdf8d8fc879631084ef901d40c1e3007c3dc947d384d801d22464054519e16`

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