PDF malware analysis — malicious · 5f9e4032cf0403f8

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 10:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5e573c8bc5ff091c8122952aec042398 SHA-1: 9b8c7143cb2895ad0e5fe8e0d66f89431b05e5ec SHA-256: 5f9e4032cf0403f8c97e79607fdf41e1aad9a7e7bdd1551ba14eecd16c929400

176 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. It contains numerous links, many hosted on compromised CMS platforms, which likely serve as a link farm to distribute further malware. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, aiming to trick users into clicking these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gngn0i69fq08hsqtv4pqfn8sse/40632791542.pdf In PDF document text
- http://accessiblevehicleservices.com/userfiles/file/77259706205.pdfIn PDF document text
- http://drapa-technika.cz/UserFiles/File/8281829728.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7ae5b8da---wafomipiziv.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/117da9679cf0a60eee5cdc59bd3b928b/77706093457.pdfIn PDF document text
- https://travellifeafrica.com/ci/userfiles/files/bemakoremeroluwukapikekiz.pdfIn PDF document text
- https://alyosserspneed.com/userfiles/files/20351409228.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9549a78c2274c434df42f3c0b4706294/55398348034.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160923edc0d705---medobiginuvigopawimeda.pdfIn PDF document text
- https://rinducm1.com/contents//files/64505467723.pdfIn PDF document text
- http://csc028.com/userfiles/file/20210821235545_spgh4p.pdfIn PDF document text
- https://citronel.com/userfiles/files/sapenazinigefilazafe.pdfIn PDF document text
- http://sibinetweek.ru/userfiles/file/2321722138.pdfIn PDF document text
- http://biosafety.biz/ckfinder/userfiles/files/18413580078.pdfIn PDF document text
- https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ldud528101k09mhgji9bpvdumg/nitokorekizifosafarokawaz.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160860f84405f8---57490453286.pdfIn PDF document text
- http://bluelakehomestay.com/uploads/image/files/lulomebozerewi.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b71b714b---vozidorufuxozurevi.pdfIn PDF document text
- http://bettynblue.com/upload/fck_img/20210717/file/jesorutokavuge.pdfIn PDF document text
- https://igraonica.me/userfiles/file/16349168282.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/penaligumibodiwutimonaw.pdfIn PDF document text
- http://flomojapan.com/upload/files/56354504796.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99e9a6f0a---pevuperize.pdfIn PDF document text
- https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/f8c42cf316b87f49923d93bb68c232de/83731824239.pdfIn PDF document text
- https://recapress.com/ckfinder/userfiles/files/72583265622.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c0cfab282e2addf7f1488aa050047419/potabexuginemalopubifib.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=laskar+pelangi+english+version+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000efbd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFBD	17928 bytes
SHA-256: `d429c3c0bab44451b2175cc5e9b46c37d6f5b8f598567f79d469a5501b724b2a`
`font_01_sfnt_off00011e29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E29	10796 bytes
SHA-256: `c2b0b2b6b526bac5ac1f97ce8f8b3d46baad5f769c46dad2872f06a2e64ac605`
`font_02_sfnt_off000136bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136BD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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