PDF malware analysis — malicious · 57a77d1cddfb46b5

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 55f3345bf6c7ec2e63bc6003fc55f5ea SHA-1: 4dabca8cd38cc1633ae4de0ecd7d8d413db3b377 SHA-256: 57a77d1cddfb46b5c069a5bb2ac61aff719454c9bb5f11bbb68f525a1ee0aa95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being used as a link farm, directing users to potentially compromised websites or disposable hosting. The embedded URLs, such as http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f0e22865---xolosodu.pdf, are suspicious and likely serve as part of a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://backkwang.com/userData/board/file/59691776590.pdf In PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f0e22865---xolosodu.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417502ef71---jibuje.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/84563d6ea50e7ebee38c75f66e0fc700/rabojanepivolomozu.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a78e694749a---51523516878.pdfIn PDF document text
- https://merydian.pl/nowymerydian/userfiles/file/pubofufu.pdfIn PDF document text
- https://kaptenhoki.info/contents//files/46887402452.pdfIn PDF document text
- http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47728932686.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d766bf88915cbef088377c58390b2daf/zoropafijem.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612999f4c64d8---53276425402.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0447650a---lawuxojofapo.pdfIn PDF document text
- http://dastone.ru/userfiles/file/xugokuxusumeralunerov.pdfIn PDF document text
- http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bofisal.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cd5f35707e967e6eda6dfc381ceae6df/tujosoziwexotufa.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c1877884c61---40198713106.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0be0c2ddf845229686bb0c4fcbaead09/libakili.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/pekidekunelezimamepopegib.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/97601922763.pdfIn PDF document text
- http://dade666.com/userfiles/202108file/2021080310500970554.pdfIn PDF document text
- http://dokumsuzgec.com/userfiles/files/2216793119.pdfIn PDF document text
- https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/da027fc5e9dbebf1e901fc8402ace1ba/jikuvanim.pdfIn PDF document text
- http://www.jokilaaksonratsastajat.fi/file/9128489054.pdfIn PDF document text
- https://fentesmakina.com/paket/upload/files/xanivelevi.pdfIn PDF document text
- http://yanartekstil.com/firma/files/xupajanigurip.pdfIn PDF document text
- http://www.eau-msu.ru/ckfinder/userfiles/files/mugib.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jsihio57vccimfnr5ojgbk0aj1/91277098446.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sozinha+no+mundo+pdf+downloadPDF 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_off0000d916.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD916	21072 bytes
SHA-256: `ee65816955a91af2c0bad008d2f9a22007ba5d4e71913c5764e9692b0b25442c`
`font_01_sfnt_off00010f7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012792.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12792	10588 bytes
SHA-256: `adf516caf0ea59fe08904b13f389d6936937a8a48bc377b6fef8c3e337e342cf`

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