PDF malware analysis — malicious · 056aafa853adb91c

MALICIOUS

PDF

91.9 KB Created: 2021-09-01 09:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 7e449782d8005b4fd346d2e2f4cca747 SHA-1: 64833b353334f8d8c1dcec68a71de523af951259 SHA-256: 056aafa853adb91c0f7fa221f654fce6158ca3e2ac18d0cc82bb72a5a5d07ff1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites, likely to obscure the ultimate destination and evade detection. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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 https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdf In PDF document text
- https://asiajitu.com/contents//files/96210621259.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6tlb37ggsct7nv7bq0ccp7sef3/ziwirefa.pdfIn PDF document text
- https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/e0g0k5vjsm8t9g5acichks9r6f/17822616178.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/5uvoj0kmbui1umudeqgs01osna/73926158956.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/lla6dnbb85m07ar9f0i22a6rdi/94435036876.pdfIn PDF document text
- http://emannsltd.com/userfiles/kevix.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vfuukfvn5o6oqe868eovt7194k/24276083927.pdfIn PDF document text
- http://wksystems.net/HotelEstimator/userfiles/file/27724817815.pdfIn PDF document text
- http://eltdb.com/UserFiles/files/67787550643.pdfIn PDF document text
- https://alternativecarrepair.nl/userfiles/file/52582645032.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tna97qubrff6sa762v5omml7nr/nanibogiwojuzi.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3597ed6c---31213484362.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35515635a---44174324113.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c773d726f94---17056684353.pdfIn PDF document text
- http://jjinline.org/file_upload/file/97113443041.pdfIn PDF document text
- http://donauwell.at/userfiles/file/49411561135.pdfIn PDF document text
- https://kermiradiatoriai.lt/images/files/26854767842.pdfIn PDF document text
- http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/fixuz.pdfIn PDF document text
- http://schokozentrale.de/idata/mamudusorasoguxi.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3e76e520247b83b5cc8b8f93ce2b6a9/fevuwisiso.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/624324572a16ea0211dcf597937af63b/vutawobofat.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hfh019envg70bc7q478n6vfbe2/33929580916.pdfIn PDF document text
- http://2017.letnifestiwal.pl/ckfinder/userfiles/files/nulebuxexa.pdfIn PDF document text
- http://costruzionibulagna.it/userfiles/files/jimivutefupimoloragapazet.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/95630548901.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ukulele+fingerstyle+tabs+river+flows+in+youPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000de68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE68	16180 bytes
SHA-256: `c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f`
`font_01_sfnt_off0000f412.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF412	10996 bytes
SHA-256: `2271f0bad4d05c945adf5e606eb3f93b0feb6d962b763787114df0cb96622234`
`font_02_sfnt_off00010dd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DD5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000125e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125E7	22840 bytes
SHA-256: `50ccb512a5f88b24a0df1c780038d5f2e3b2e2c8724c732d0bffaf0bb5a79c4e`

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