PDF malware analysis — malicious · 560f50dcea8f1a53

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 15:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fcb0cb5c3645d0fb2f57eb53e62c981c SHA-1: 91d66ce8feff7cf2863a840fdc24cdc24834051a SHA-256: 560f50dcea8f1a53eef558e50d68e2df5b05e8a5873c5151febdbfeb6fa26ad7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'plagiarism checker' UTM parameter in one URL indicates a potential lure for users seeking document analysis tools.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=plagiarism+checker+app+for+android PDF link annotation
- http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67448802803.pdfIn PDF document text
- http://dermatologomiguelgallego.com/miguel/fck/file/karubekobixif.pdfIn PDF document text
- http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lurilexajaweb.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137488b68f5d---61627786616.pdfIn PDF document text
- http://khamtribacninh.com/images/files/56650424773.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138172ab1055---26017965841.pdfIn PDF document text
- https://normec-cm.com/ckfinder/userfiles/files/77143180668.pdfIn PDF document text
- http://fcv-bo.org/data/fcv-bo/userfiles/file/pawefadaguz.pdfIn PDF document text
- https://veterinarycarefoundation.org/userfiles/file/54401585596.pdfIn PDF document text
- http://chanhungcorp.com/images/uploads/files/14392863222.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87de7705e---98293831197.pdfIn PDF document text
- http://ebsenglish.net/_UploadFile/Images/file/51046035345.pdfIn PDF document text
- https://aynispirit.nl/userfiles/file/39755469043.pdfIn PDF document text
- http://sivam.pl/files/file/gekekatalelif.pdfIn PDF document text
- http://mrcookie.tw/upload/editor/file/111601155144.pdfIn PDF document text
- https://gianlucabruno.it/dati/upload/file/torofesujuwevu.pdfIn PDF document text
- http://demkapi.com/resimler/files/96277154547.pdfIn PDF document text
- https://textmakareknutsson.se/upload/image/gunanutawafazusonobekad.pdfIn PDF document text
- https://ceylanotel.com/firma/files/62978904735.pdfIn PDF document text
- http://legalinet.eu/userfiles/files/76272328484.pdfIn PDF document text
- http://thehedgerowchronicles.com/ckfinder/userfiles/files/60522756106.pdfIn PDF document text
- http://yenidenyuzlendirme.com/ckfinder/userfiles/files/danozumopemekas.pdfIn PDF document text
- http://corse.annuaire-regional.com/ckfinder/userfiles/files/68593088318.pdfIn PDF document text
- https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/54992019497.pdfIn PDF document text
- http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/roveme.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_off0000ec8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC8E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000104a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104A5	11060 bytes
SHA-256: `db8402b86db9bb679f2ce08fc0ad92c30292ba3937e180ae496902ea9264dd1b`
`font_02_sfnt_off00011df7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DF7	17532 bytes
SHA-256: `13f87d6de144c289624de005898f46836cdf59d4af5d2e478ee625d2fbf71e47`

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