PDF malware analysis — malicious · 959db5a33ae69e24

MALICIOUS

PDF

142.9 KB Created: 2021-09-05 23:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 5c36d622552447e9d9edbd13858503a4 SHA-1: f26214ba933a4282922e3d8b0fd9b240fbbb7aea SHA-256: 959db5a33ae69e24dfa8686c8f9e5384b7c4dd86daff1e2d1193a4c312803c88

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9323

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://agnieszkapawlik.com/userfiles/file/55710766373.pdf In PDF document text
- http://sieuthimaynhapkhau.com/upload/files/fufifagu.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a45a452f73545eefe68a72338a2bc483/56340171293.pdfIn PDF document text
- http://miwon.com.vn/app/webroot/uploads/files/wubet.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df196962c---zamobijovafozofagegimu.pdfIn PDF document text
- http://mywayrtk.info/userfiles/file/gupinumi.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/nk55k6mn7rhfrc332htjpcnbjo/48451462893.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ba302946---xiwiluxotisevorun.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe22cacaba---89238928608.pdfIn PDF document text
- https://dunakanyarfesto.hu/ckfinder/userfiles/files/mujejelumizisadirenod.pdfIn PDF document text
- https://tonymusic.se/UserFiles/files/vexev.pdfIn PDF document text
- https://study-abroad-travel.com/ckfinder/userfiles/file/16477248892.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161074a45b1018---lawugozekuresulub.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1c2ba2b2---befaduzesuk.pdfIn PDF document text
- https://tmtteks.com/files/33705119890.pdfIn PDF document text
- http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd02fc3d5b---kepawijafenaso.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/k4q7jra6up8t7fvd5c5k6u8oql/nasomikazedonobi.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bee6afa35cba02623f69a06bf0ad6a5/61828240178.pdfIn PDF document text
- https://www.premiumtrade.ro/ckfinder/userfiles/files/85943939332.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8bb57f06---mipopujinetijumij.pdfIn PDF document text
- https://bdprescription.com/ci/userfiles/files/45784116727.pdfIn PDF document text
- http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/789543504.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8247a9909a938b0eaf02206c1f5b5fa5/gajevobodiminovo.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cic5narnbdeqap5mk0oj9aopma/wixed.pdfIn PDF document text
- http://flexa.cz/docs/file/balolajozujezuzewerupo.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e60eb830---31255226833.pdfIn PDF document text
- http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/8673799205.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=speech+on+iqbal+day+in+urdu+pdfPDF 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_off0001a978.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A978	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001c18a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C18A	23924 bytes
SHA-256: `a632430d552a7a2404a3ffcf4443d80e97b94a8428a8aa031809b1880c4fa1cf`
`font_02_sfnt_off0001fe5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1FE5C	11024 bytes
SHA-256: `6edc0764627f3e95848a678774b3ad1223e6d6fbdef1983cc4ad278d114ce35c`
`font_03_sfnt_off00021772.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21772	16164 bytes
SHA-256: `a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1`

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