PDF malware analysis — malicious · 90b7ef61aea0fb70

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 10:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a1157a989c489f819459c3ad8f58577c SHA-1: 6ca0c332085d5c4f00cc3add5b2120d1c1abcdbb SHA-256: 90b7ef61aea0fb7007da64d883a2c0141d94321c5bb8b02c9dbd611cce26ff73

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of urgency language in the document body further supports a phishing or social engineering attack vector. The file's structure and embedded links are consistent with a malicious PDF designed to trick users into downloading further payloads or visiting phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://crysiq.ru/uplcv?utm_term=alnajat+frp+tool PDF link annotation
- http://assotechne.eu/userfiles/files/76742940953.pdfIn PDF document text
- http://arniuniversity.in/ci/userfiles/files/xituzetadutiwe.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2a86c199---wibugut.pdfIn PDF document text
- http://cuboni.com/uploadfile/hong202109152144169589.pdfIn PDF document text
- https://grandegroup.net/files/sezavisugerumised.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/04cdd30a673af1a60214029663be1d8e/mijujudogijamet.pdfIn PDF document text
- http://tmkb.org.tr/ckfinder/userfiles/files/84757396826.pdfIn PDF document text
- http://hemeringen.de/ckeditor_ablage/userfiles/files/31544789091.pdfIn PDF document text
- http://mywayrtk.org/userfiles/file/58665549525.pdfIn PDF document text
- http://yearbookplus.com/uploads/ckfinder/files/14901517518.pdfIn PDF document text
- https://nibrasimansch.com/userfiles/files/44058875093.pdfIn PDF document text
- https://jackinthegym.com/uploads/files/202109030823388422.pdfIn PDF document text
- http://www.vinoplaza.nl/img/upload/files/febevet.pdfIn PDF document text
- http://designbyjoseph.com/uploads/File/taxujufufenow.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e3eb1231bf231a493f415ab3799185b2/bikolupiwidefus.pdfIn PDF document text
- http://giprozdraw.ru/ckfinder/userfiles/files/majemivilumu.pdfIn PDF document text
- https://geneticapanama.com/userfiles/file/89209939061.pdfIn PDF document text
- http://printific.com/images/contentimages/files/mofenosobolurorimelek.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/47325025245.pdfIn PDF document text
- http://flooroverstock.com/admin/userfiles/file/mufuzuponozetel.pdfIn PDF document text
- https://kligi.viart.lt/ckfinder/userfiles/files/puzimu.pdfIn PDF document text
- https://egokituz.eus/files/galeria/files/gubefonag.pdfIn PDF document text
- https://nichecnk.leaddeehub.com/userfiles/files/66236649423.pdfIn PDF document text
- http://vishwkarmaenterprises.com/webroot/img/userfiles/files/11823925854.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_off0000da9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA9C	18044 bytes
SHA-256: `32f4c2f19ca610495b603c7a5726ce17e6fbacb77dfb62a2842b88a264dcdd59`
`font_01_sfnt_off00010984.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10984	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001219b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1219B	10072 bytes
SHA-256: `913b977c2029f911f4d93f2937849052da85eca9dfc2190dd223b4d4eb995a76`

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