PDF malware analysis — malicious · 8967c37062d1a9e1

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 02:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 79d6eb9d11946216746ad92284182a3a SHA-1: e22c8c75058ecd5043b9e897b0a0a3acdeff0246 SHA-256: 8967c37062d1a9e18df1ec49e8b3d6c54e12c55ffdcaa794a8107ed9a47d1abc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as being on disposable hosting, increasing the likelihood of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gmhajkkqh2km8e0kvp7va1dhl7/jovisefukutozopubupuzemu.pdf In PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1174335f1---naligixekifotupowaguwib.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a9j44k2vsifq4heuju5l2edf65/disoditanaze.pdfIn PDF document text
- http://flatadministration.com/uploades/fckeditorfile/tezivulo.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/47b61a6ca5e65beebd4e7a4b93cf79a8/24898451721.pdfIn PDF document text
- http://alhouti.com/userfiles/file/98512251873.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e419e10e640---matapejajiduvadovafegubid.pdfIn PDF document text
- https://agentcctv.com/userfiles/file/rewusadomoxizu.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba908505849---534476368.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/61762018489.pdfIn PDF document text
- http://elitvorota.ru/f/file/41825295711.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ne8t8j3srrj0lrakkqvok8r94/nelefusovised.pdfIn PDF document text
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c8547ea01---tupit.pdfIn PDF document text
- https://adasms.fr/userfiles/file/lisedukojatapabax.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f7507b89cc133996ee3b3b443c2faaa2/fovujajikifusuwuxijus.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ab83d8d91b7a07c5699e3c184a5c0f61/55645564580.pdfIn PDF document text
- https://mimpiindah1.com/contents//files/4262136509.pdfIn PDF document text
- http://chingyi.tw/userfiles/files/62424628687.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b386d3b1---2766637309.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ch0ej3n1krjvrs7pkcova6m1r5/63641464507.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5477d24dcb---29104325365.pdfIn PDF document text
- http://flygarfield.net/userfiles/file/6757711898.pdfIn PDF document text
- http://e-hane.com/files/puremisuzidorigaz.pdfIn PDF document text
- https://vivekanandbawwa.com/userfiles/file/jifewema.pdfIn PDF document text
- http://bouncebodysupplements.com/newerac2c/userfiles/file/16469383704.pdfIn PDF document text
- http://thaide.org/userfiles/file/76496238285.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c978da91a850951229e5eac7dd3d11d9/42273259094.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=i+think+my+breast+milk+is+drying+upPDF 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_off0000fb56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB56	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011368.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11368	17120 bytes
SHA-256: `9391f98de77daa6d1cd8262efce3543d522cdda5e4a3281ee6d56345ed967839`
`font_02_sfnt_off0001400e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1400E	11116 bytes
SHA-256: `3df690c3df48e76f177c623b573e94935385c1697a2cc53a8f7506fabc9e1efa`

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