PDF malware analysis — malicious · 39e08f8fc4f97d47

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 21:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: bf7048363ab204dcd9dcccaf75fe191f SHA-1: bd555c7c204095e09f4096fb944556d8efa76df8 SHA-256: 39e08f8fc4f97d474e0e0e75900ee371d00b83691d3855ca007067ae1f8f2e2c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request, a common social engineering tactic. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://peter-crooks.com/userfiles/file/xanawogozebolikizesav.pdf In PDF document text
- http://www.amanuttarakhand.org/ckfinder/userfiles/files/zalisebizoweginubazakif.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161442cdc23e2a---35423130991.pdfIn PDF document text
- https://safarekhoob.ir/basefile/safarekhoobir/files/ramopijemoroxezujov.pdfIn PDF document text
- http://acsalma.hu/userfiles/files/merexetosilomegimu.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4a011bff---votononisobufibupenilana.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4sapkia7nl80e0q48gm0m6bmd/8157413167.pdfIn PDF document text
- http://cheapmarkt.com/userfiles/file/belebujizigojebopipuzor.pdfIn PDF document text
- https://living-stone.lu/userfiles/files/73377268543.pdfIn PDF document text
- https://ewdel.cz/ckfinder/userfiles/files/89637614847.pdfIn PDF document text
- https://haidangpc.com/contents/files/makoxur.pdfIn PDF document text
- http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/nutum.pdfIn PDF document text
- http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
- https://mps-india.com/userfiles/files/26404097724.pdfIn PDF document text
- http://laihoawedding.com/app/webroot/upload/files/tuxivij.pdfIn PDF document text
- https://tenutaedone.com/filesUploads/file/jaduwekodubobasifujowow.pdfIn PDF document text
- https://siangyun.com/upfiles/editor/files/29677370863.pdfIn PDF document text
- http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zovareni.pdfIn PDF document text
- https://everestart.com/images/stories/file/tebofedufoxelodekidufirax.pdfIn PDF document text
- http://tuning-zone.eu/userfiles/file/42324394732.pdfIn PDF document text
- http://poney-club-romilly-aigre28.fr/userfiles/file/16426318950.pdfIn PDF document text
- http://tizianaiberti.it/userfiles/files/3042462883.pdfIn PDF document text
- http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
- https://questyme.ca/userfiles/file/vudokunuvifuvateno.pdfIn PDF document text
- https://ww150007.linebot.net/upfile/files/20210912202643.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=invoice+simple+androidPDF 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_off0000df22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF22	18084 bytes
SHA-256: `cf4811697054fca2bec430f09101e2bb60e298188445c66a498747420531d2f5`
`font_01_sfnt_off00010e24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E24	10596 bytes
SHA-256: `2c2ea824293e63c79833863d010ad4c6ce91a4073879d99d2fcae3365175a921`
`font_02_sfnt_off0001264b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1264B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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