PDF malware analysis — malicious · 11fba617602e7b98

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 06:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4a31e6d32e4595052184ee9506ca1c85 SHA-1: aedce71fcd76860d70ffcc5b5100a5b3f10583fc SHA-256: 11fba617602e7b98cb6ab9d9829e184f03de1b3f6efda039d64e2eebde1877c9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. This suggests a tactic to distribute content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the structure points towards a phishing or content distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 5

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://colorfusion.us/admin/images/file/74764936053.pdf In PDF document text
- http://ecohost.ru/pics/images/file/zuwegufenexijutojadug.pdfIn PDF document text
- http://foto-klub.dk/userfiles/file/62834510738.pdfIn PDF document text
- https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f8217166---gowarakigubenetixofoku.pdfIn PDF document text
- http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/gabotupabesubobebojox.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a521044c4---40086529567.pdfIn PDF document text
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/na8jrfgboaodr2cb47stmh0p9n/55758864856.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d714af5a1---89320375640.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5656dfda9---99549619923.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a9a5210f---89968954543.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/cfu24ohjvgo6cvlk3hngjpks13/mobemefon.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/611258feaaa6a7a4c7ff3c34ac1c5900/41021075327.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/can6mpd1trd10n417djkbc2q0s/47357829069.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e2d243f80f42bd56436d21d5165b537e/68820518707.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/041af5f2b52d996682f9b4527fc0828f/bepabotisevusugo.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc6993ff7---55970358671.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lihondfa3cgtuvvd5hp2ojjno7/54902976977.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7ab0d9991f819c4be157e09695829e17/xonetifem.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p5tee0p8fds3k29ndloa1eg9d0/pujujubiz.pdfIn PDF document text
- https://jpjplumbingandheating.com/FCKeditor/file/96874621982.pdfIn PDF document text
- http://bjsprt.com/uploadfile/file///2021052501505696.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ff7b0d3b40438f010621ba88acadf205/motexajizavotarog.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9e621d847---kujisegoz.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/53864c30f46822848c02c25d1ee9ace1/35860059873.pdfIn PDF document text
- https://bandotrading.com/uploads/file/25308918180.pdfIn PDF document text
- http://tunesistudio.eu/userfiles/files/74922409836.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=find+the+missing+side+of+a+triangle+with+anglesPDF 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_off0000ec5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC5D	16296 bytes
SHA-256: `1cb79be680479ea6353eec4be745454f40c82a7075815a0fd564c19d4a01f661`
`font_01_sfnt_off000116b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116B8	10864 bytes
SHA-256: `9a5ab66854cac5e373ce04c9d3551a0830bb3a45bd346bf9a4d3c1afbe8f295f`
`font_02_sfnt_off00012f6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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