PDF malware analysis — malicious · b43c5b73746d3443

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 00:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 3abc5250c7590999a496a75c9583cbd9 SHA-1: 63cbe37a4a5750d35cafb6c3ad1c7be7fecea9bd SHA-256: b43c5b73746d34432ea6a84748353ba6845d25a5714547781a7bfeadce0ecc41

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5b965de070d24a0af1f348e6402488a9/85479773253.pdf In PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ecbhl2tttiak3o9rrmrgjkprnn/8945904362.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5m7kut2km78tbudc0ung6k850/duludepagoweput.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a72dd8b540d---vibenewigapusebos.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/664c3aaa6734c21eb68812be7f1c61aa/40590869577.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9ca869272---lesorufusipokinebasomonod.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/grtl1kt3cn968h1be5usqbvu27/demudajajeranedogegim.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a2699d5992c96108c455994dfff99d3/pefizuveropazobesikef.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfb16b642---15934171985.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/96sposdipcakqe1eushl3vv4tv/44998423443.pdfIn PDF document text
- http://flexa.cz/docs/file/48682566596.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7vk4ta71hi8s6i2m5v1kg76i14/mazuwifewagiwibivaxoj.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608831e5cbb52---gifajexiwimokofoj.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b65ebe695c9fb982836c0af50648c280/lovufaxus.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c68dc78f---pajima.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbec5e0a841---12086649656.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f33c74391aa7510975150d9087e23f74/riwariseto.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c7b3661c86a1f2f6fb4e31aba0ba52c3/daxigofesegusabulejanudex.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87a919290---81798068004.pdfIn PDF document text
- https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/30e1861abv8l2g7duv6sidi040/55527844635.pdfIn PDF document text
- https://area5srl.it/file/67956903243.pdfIn PDF document text
- http://findmealocalpainter.com/insurazon/admin/userfiles/file/xejorexefetedobajo.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a9b11d14f3eed65df595f0e625e0dbec/31394261605.pdfIn PDF document text
- http://tulsamemorialclassof71.com/clients/84987/File/1713725297.pdfIn PDF document text
- http://agendatourvietnam.com/hinhanh/file/56231151065.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a54a4993979---8743577857.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+the+boys+season+2+episode+4+123moviesPDF 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_off0000f06a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF06A	17744 bytes
SHA-256: `ed85a1052858368a54bbd91e612a0e2da105bb0c4a53b599add579c6989efa27`
`font_01_sfnt_off00011f14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F14	11368 bytes
SHA-256: `702daf6eb574785bfc1c2d3a2c92458c278817866d7b94a0a01a1334755a8f71`
`font_02_sfnt_off000139ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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