PDF malware analysis — malicious · 3ee21ca9ce9b7181

MALICIOUS

PDF

101.6 KB Created: 2021-07-30 18:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0bf6ed23b315c5c42cd0af679d6b7877 SHA-1: fd891211bc77fde672b1414bc448ebe32d14e64b SHA-256: 3ee21ca9ce9b718174772a633f7af2f74dbe15dfbdeb799f3a3ffa4574e77d34

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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://vietnaminsight.biz/ckfinder/userfiles/files/wolasidizifajidudijem.pdf In PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///2021061722747_390208606.pdfIn PDF document text
- https://equator-maritime.com/userfiles/file/fonosenenevuze.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dc2cb8226215ab46d0faf2e83715b12/93895600860.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ac37e6b49ebe0b0fa9c797b7669b9b94/24472666347.pdfIn PDF document text
- https://likeevent.it/writable/public/userfiles/file/tajifalomidopasej.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/6697450452.pdfIn PDF document text
- https://scriptdd.com/_file/file/60082539767.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10047f1ff---94233912053.pdfIn PDF document text
- http://sake2metustin.com/uploads/files/6376696276.pdfIn PDF document text
- http://studiostocchi.eu/userfiles/files/pevav.pdfIn PDF document text
- http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/84326183661.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/42530720987.pdfIn PDF document text
- http://geose.ru/userfiles/file/46970405804.pdfIn PDF document text
- http://fratellilongoni.com/userfiles/files/47626982266.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d2a2635d---bodibupefukikep.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f2572bae5aa5444d1e58164ce4579f40/moxibuzazujeweruw.pdfIn PDF document text
- http://avandcie-automation.com/ckfinder/userfiles/files/6556074933.pdfIn PDF document text
- http://alemotta.com/resources/original/file/zagaratagiroz.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086861be456f---86043313276.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8389f7e49f4d46986060fcaff04b7a13/78932180940.pdfIn PDF document text
- http://cloverpark1959.com/clients/51168/File/65791695512.pdfIn PDF document text
- https://baptistfriends.org/media/95042352039.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079b916aaa---rejolubesadelub.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mgmt614+handouts+pdfPDF 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_off00011082.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11082	16060 bytes
SHA-256: `2f306665d4631bf5729dee2f35834acca0f59e1db4db562b112de954dfadcfa4`
`font_01_sfnt_off00012597.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12597	17628 bytes
SHA-256: `31449769e0d3560ff168b22b326babadc68651a228c27e49428a27f6785a59d3`
`font_02_sfnt_off000153e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x153E0	10968 bytes
SHA-256: `2dbc7fb9db962517beaf9f866651971f7bb6e55a15a07fe086d62ac83c9bbf08`
`font_03_sfnt_off00016d19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16D19	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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