PDF malware analysis — malicious · a2f1adaf5963c17e

MALICIOUS

PDF

86.3 KB Created: 2021-07-22 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 2c2751e20a3af82383fba72a1842269e SHA-1: 2594c7c0d9d9813bdec4739abe6f419c47fad694 SHA-256: a2f1adaf5963c17e4ee82cb9cac41e49244161e48fd7d405f45dcd2942f1b133

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

Heuristics 6

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.
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://12shio1.com/contents//files/wuzogigexob.pdf In PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160decde86539e---gopotumusofuv.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160882f180d8af---70989100225.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/90991704500.pdfIn PDF document text
- https://ridersshop.it/file/62932636668.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd32898f2---gifusitetamumabo.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7ce5596d---82856375178.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1f8d63056---tuwadexababupememipatol.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b064957536a9a2ecd7f961dbd8d6f76b/xatugokoked.pdfIn PDF document text
- http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/44063560488.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2f9e4f01cf5e6abc3d8edc4be8d0dc0d/44376738767.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac2f51a76---45588552971.pdfIn PDF document text
- http://pantipplaza.com/userfiles/file/45820908656.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd78e32be9---bufizitunizodepufi.pdfIn PDF document text
- https://davaocarrental.com/images/file/nudirozajaboforafujegute.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qnugpn6q2i5d39nbkmo4uaj0vf/27641479378.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sfmvoe17vg6tnbt131t7d0b8r5/kosamefumilisavuraboreros.pdfIn PDF document text
- http://carrozzeriabosini.net/userfiles/files/35361994081.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/remozekamudenuzir.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160831887538c1---lenomejij.pdfIn PDF document text
- https://baoholaodong24.com/userfiles/file/mipuku.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1085da634sp4hok3nn155r9j22/lizinezobumetomudisasabep.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7314fbbb89---jovebimizexasozigi.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ff8c7fdc044c8adef242d5f7cbe0a7d7/novezoxokuvegubakilamu.pdfIn PDF document text
- http://namjapizza.com/app/webroot/files/watewodiz.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefb27e7d---vofajosanizigibosuva.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2017+7th+grade+reading+staar+answer+keyPDF 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_off0000d3ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3ED	16312 bytes
SHA-256: `7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae`
`font_01_sfnt_off0000e9f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F4	18080 bytes
SHA-256: `25e55f2cfc4bb8a5f687e63e645d77ce099a9aac67ccadfa3a5d6b341bad4e9b`
`font_02_sfnt_off00011939.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11939	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013150.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13150	10900 bytes
SHA-256: `c0287a324281baa4529325560123f2e8f0b05dcd8a58371d7161f81e269c60df`

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