PDF malware analysis — malicious · 96b5be2c64adab82

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 06:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: dc21a0cde3db31f6c2929feeffee8b4b SHA-1: 66f56de808e1bba61481dbd20df69f9edc5055bd SHA-256: 96b5be2c64adab829922a0fd433a10532bd408b51118673a33ba49cd1a778cac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm. Heuristics indicate these links are likely used to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

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.
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://irlanc.ru/uplcv?utm_term=nearby+share+apk+download PDF link annotation
- http://thoitrangvabaoho.com/Images_upload/files/81464291036.pdfIn PDF document text
- https://axlthailand.com/imagexx/files/38472777819.pdfIn PDF document text
- https://genegurumiraclehealer.com/userfiles/file/64707328589.pdfIn PDF document text
- https://408of53crownstreet.com/assets/media/files/24634983751.pdfIn PDF document text
- https://defrokatilai.lt/images/files/vawusetabasisilomawadak.pdfIn PDF document text
- http://sdv.sk/userfiles/articles/file/85960142349.pdfIn PDF document text
- http://youngdongtec.com/userfiles/file/49145772859.pdfIn PDF document text
- http://videocycling.info/files/file/rusogewimaz.pdfIn PDF document text
- http://smsalumni1971.com/apadmin/uploads/userfiles/files/11188432192.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1e48f4dc---90022054067.pdfIn PDF document text
- http://ersenergy.com/UserFiles/file/7532932850.pdfIn PDF document text
- http://ville-dammarie.com/ckfinder/userfiles/files/jatosunalizirutuda.pdfIn PDF document text
- http://eaupureinternational.com/userfiles/file/15585660151.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ccb286884---9510557436.pdfIn PDF document text
- http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kodumexojutegavoperibiti.pdfIn PDF document text
- http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/10094758760.pdfIn PDF document text
- http://ecovn.vn/uploads/news_file/44556512099.pdfIn PDF document text
- https://liho.cz/UserFiles/File/temusogonuxuduloxav.pdfIn PDF document text
- http://metrominicabs.com/survey/userfiles/files/netitalokazudamoraso.pdfIn PDF document text
- https://kenkochaya.com/user_data/ckfinder/files/40601903971.pdfIn PDF document text
- http://xszhuhai.com/uploadfiles/files/2833851355.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021090803234588.pdfIn PDF document text
- http://dmhu.eu/uploads/uplib/file/kazap.pdfIn PDF document text
- http://sinojjacob.com/userfiles/file/lowojabeveragobajil.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b5b2ee84---defadiniwupuxopetobokog.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1498e1e5---wiwosomevejesapowurosulo.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_off0000daee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f300.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF300	17340 bytes
SHA-256: `fbb22325cc94804191795cedcc3969e655f9e8eed214709101eb9e34472ed6e3`
`font_02_sfnt_off00012042.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12042	10708 bytes
SHA-256: `13261ec31dd6cb694041a8c47138c72984724014eb2c2f4757db94312bd6f966`

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