PDF malware analysis — malicious · f1731ade4bb94d94

MALICIOUS

PDF

73.9 KB Created: 2021-07-16 16:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: aad18af9e98ad3462e3c21c8b2fea567 SHA-1: 2dd14b4f7f7fba41d64338d21a6d347353af229a SHA-256: f1731ade4bb94d948039deb0264c5be65a9f803508747d67498f7587bafd7b10

116 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608560639e90e---bafewadewabamig.pdf In PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4b34f63b---2475197828.pdfIn PDF document text
- https://amadesafar.ir/basefile/amadesafarir/files/rulupebujezukureko.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf481b2d7a---82818641865.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0074787001625285968.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ca190acd---jorifujalatib.pdfIn PDF document text
- https://homecareangels.ca/files/files/files/46329401072.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/24f9c7e13a3bc8651f600125f60e0290/59001865420.pdfIn PDF document text
- http://modnyi-buket.ru/uploads/files/44358926032.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h48aak6dg3t8v9paggeiiktk43/53438812660.pdfIn PDF document text
- http://apsons.eu/files/file/wiwuw.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a44144a35ad---pudir.pdfIn PDF document text
- https://bcbc3399.com/upload/files/xabagesexivimojig.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/gezokawelamujuzutiritug.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7480e855fa---ruximejafazupogimu.pdfIn PDF document text
- http://cissi.it/userfiles/files/76734590838.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837ea23bfef---17226025550.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160891029d778f---66009279568.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c97d4ca1---7806852063.pdfIn PDF document text
- http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/04f4641145d52bb422b13604979d1c41/4634467274.pdfIn PDF document text
- http://visit-pune.com/userfiles/file/memirap.pdfIn PDF document text
- http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/69807428725.pdfIn PDF document text
- https://cqc-material.com/app/webroot/userfiles/files/125296695.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=building+construction+act+1952PDF 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_off0000bedf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEDF	11040 bytes
SHA-256: `a83e7cd3c21fa446936318b3065091d4496b736d9eb9351a2395e1fadad0889b`
`font_01_sfnt_off0000d89c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD89C	16244 bytes
SHA-256: `671f0741bdf4b8b19b6a7aa134abfaa2ea9ec216a5e1223b3ba73cc0ef20ac7c`
`font_02_sfnt_off00010282.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10282	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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