PDF malware analysis — malicious · ca57d4e5cc52cfbe

MALICIOUS

PDF

85.2 KB Created: 2021-08-23 12:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: eb92c1883cdb8aae9060cf5c4bd4b7c0 SHA-1: d48ec33887a2f4c56443e7d89551663bf9d33eb2 SHA-256: ca57d4e5cc52cfbe9dfe4a9e72fe17345f671671177380c88577ec349d438cbd

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the presence of multiple external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://archism.ru/uplcv?utm_term=a+photograph+question+and+answer+class+11 PDF link annotation
- https://aprilboya.com/userfiles/file/54923056999.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6aec04a---12653528032.pdfIn PDF document text
- https://biblioteka-koneck.pl/ckfinder/userfiles/files/kiselovazex.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0b59b4f14acc8d5bc419111ab826a07f/73137565295.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/105ebbdd17d0002dbd6583b1f2eaa213/13637393171.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/37d036cd0e5d40b82e10305ce80adb3e/76893222823.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/zufesezupo.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/18bc36619c36fd993c44e18c5d73bb18/10561864315.pdfIn PDF document text
- http://pechati-piter.ru/userfiles/file/punadofawufigapuv.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1935f84da5ddd1ddf5fa42ecce5017e0/25066922930.pdfIn PDF document text
- https://epiphanych.com/images/file/xositodef.pdfIn PDF document text
- https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/mif7gh81ostdkfrua34eoe8j03/25639780753.pdfIn PDF document text
- http://pscemetery.com/userfiles/file/vawirepatagulenetes.pdfIn PDF document text
- http://ulleungroadtour.com/FileData/ckfinder/files/20210713_DBCBCD4FACC49F3B.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cf68bb323---rujiw.pdfIn PDF document text
- http://weorderfood.com/uploads/files/5741600848.pdfIn PDF document text
- https://mzr-avocats.com/buddha/ckfinder/userfiles/files/jabitoridudegoposijipax.pdfIn PDF document text
- http://vimbark.sk/editor_uploads/files/sabogedudinugeli.pdfIn PDF document text
- http://pierrevillers.fr/mairie_files/file/90644038484.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1fdec0b4---jewipalodexepovefuxutugif.pdfIn PDF document text
- https://tenshinorchids.com/FCKeditor_upload/file/daruwizodirijikaniw.pdfIn PDF document text
- http://simoncaulkin.com/images/17696022565.pdfIn PDF document text
- http://0985028898.kad.tw/kads/ckfinder/userfiles/files/77785749164.pdfIn PDF document text
- http://sm.ac.th/ckfinder/userfiles/files/83658990837.pdfIn PDF document text
- 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_off0000e809.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE809	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001001b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1001B	17288 bytes
SHA-256: `e1b4e5a56caea3c252228b49541cc6b8a550a065dff79a3ee9054c389ab69187`
`font_02_sfnt_off00012d65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D65	11156 bytes
SHA-256: `8284b3479bbc35660389b80293e7a1d58185f54dcde12fd26e03f858d5ad54d1`

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