PDF malware analysis — malicious · 5306ef6dca044f7d

MALICIOUS

PDF

96.5 KB Created: 2021-08-20 06:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4452d239e186d24936c10a4afe793a2a SHA-1: 00871ea61963f7b7022fb69973c26d5ec57b6eeb SHA-256: 5306ef6dca044f7d8cc86ac6a1f3bd83ef06cc6db10dc0e89d0e702534169ca1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users through a series of links, likely to a phishing or malware distribution site.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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 http://alemotta.com/resources/original/file/48078048638.pdf In PDF document text
- http://unnatiwelfareorganization.com/ckfinder/userfiles/files/lipulubupuxewizobad.pdfIn PDF document text
- http://alpha-cp.com/userfiles/file/28878423178.pdfIn PDF document text
- http://brenna-ski.pl/userfiles/file/rogodokozodatomi.pdfIn PDF document text
- http://salon-urody-bellis.pl/images/file/pajefolipibefesapuxu.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607beebd2f8a4---waremezunuruxa.pdfIn PDF document text
- http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
- https://sanidom.pl/img/file/fefokepesubi.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c19c5dafdf1d23098a3108df9bbb27c1/lafezi.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/namarow.pdfIn PDF document text
- http://windowsplusllc.com/ckfinder/userfiles/files/4843306164.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ecd956b5---demosibufuxaxetox.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qnoekml7r0v97ndaelkuem4570/63475355459.pdfIn PDF document text
- http://veszpremlizards.hu/_user/file/78769428112.pdfIn PDF document text
- http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f050c01d5e---52176901902.pdfIn PDF document text
- http://caigeshi.com/uploadfile/file/2021060616023573499.pdfIn PDF document text
- https://www.greenlakecruises.com/ckfinder/userfiles/files/pexasegomebagapudifoleda.pdfIn PDF document text
- https://autoandtruckrepair.net/nbloom/fckuploads/file/99820991019.pdfIn PDF document text
- http://europavloeren.nl/siteimages/file/10416288884.pdfIn PDF document text
- http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/20219864240.pdfIn PDF document text
- http://giovanniseneca.eu/userfiles/files/1633066201.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9cb3b048069230b0bcd9c7ab10b8f523/bajumotebefoxokutulo.pdfIn PDF document text
- http://hotelpenza58.ru/ckfinder/userfiles/files/66586638499.pdfIn PDF document text
- https://alsultantrading.ae/userfiles/files/pakefenumemedu.pdfIn PDF document text
- http://jiangsutravel.kr/userfiles/files/20210819_014855.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d1c6b8621937cbcdf58056626917def2/42844166301.pdfIn PDF document text
- https://sikanderajam.com/Robinson/ckfinder/userfiles/files/selixu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=integrator+and+differentiator+using+op+amp+applicationsPDF 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_off0000fa88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA88	18264 bytes
SHA-256: `e52a21918b39fc91f7c7fc280951c9c98fd6f88f27272abb4f3002efbb314a53`
`font_01_sfnt_off00012b73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B73	11012 bytes
SHA-256: `4b417024b5c540ac1d69f92ad0d01e198f9dcf138a8d11ae997a453bfad415e6`
`font_02_sfnt_off000144d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x144D2	16108 bytes
SHA-256: `9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910`
`font_03_sfnt_off00015a07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15A07	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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