PDF malware analysis — malicious · fb6480f3f5c3464c

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 10:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: cf23166889aadca72626edb9860be431 SHA-1: bf213deefd17c8ed81799d5057e155234089ece0 SHA-256: fb6480f3f5c3464cdea52d4470c9e3203ca94259039f2077d406f07e67d6b76c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://sakkestadbil.no/userfiles/file/66829206302.pdf In PDF document text
- http://clarasonic.com/upload/file/43342052177.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/qhtu43t9douimloe77qll1sp60/24064132543.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f4496f68---verexumow.pdfIn PDF document text
- https://przyklejki.pl/userfiles/wikaboliguwirivixulakexil.pdfIn PDF document text
- https://scalper.ir/data/files/file/57441268873.pdfIn PDF document text
- http://joltiy.ru/uploads/files/xenovigu.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845b25490b2---97115255914.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2499328d9---36993067511.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95062a802004ffa7c56c98d653b91c51/1625631053.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/41c532d832b4c0b506eaf36ff50be18c/94908261097.pdfIn PDF document text
- https://clifestyle.net/uploades/userfiles/file/27992005630.pdfIn PDF document text
- http://zwickerfoto.hu/_user/file/mopokupon.pdfIn PDF document text
- http://evevoyance.fr/adh/.-/file/16865249263.pdfIn PDF document text
- http://miet-boot.ch/images/uploadedimages/file/vafazotafe.pdfIn PDF document text
- http://trustycctv.com/ckfinder/userfiles/files/8226786845.pdfIn PDF document text
- http://kristenpell.com/userfiles/files/lazuzotajipajorakeron.pdfIn PDF document text
- https://rcot.org/userfiles/file/60590592924.pdfIn PDF document text
- http://onroerendgoedindex.nl/images/uploads/xumadumagawezufixewokot.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/58187890508.pdfIn PDF document text
- http://princeworldwide.com/multimedia/userfiles/file/visif.pdfIn PDF document text
- http://sdes.in/uploads/guvunazenevusum.pdfIn PDF document text
- http://easternsheep.by/app/upload/file/dudawuxevusupokivo.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3d51989a4dfeec5165d5affccfe5ae1a/39125150137.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q6pa29cr43fh0b4r4lhk6kdp5i/kojawamewiga.pdfIn PDF document text
- http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/hb156apdjhrhh5fupjv4sknfn3/mezawusanebiwizunafiva.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sofa+score+sepsis+pdfPDF 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_off0000c820.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC820	17216 bytes
SHA-256: `33dfd5a86d30b606957bec31f1ec1de63c4359c5c2ebe07dfdb0c3e2463b744e`
`font_01_sfnt_off0000f41f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF41F	10440 bytes
SHA-256: `5aaf976f414c3d51aa30d111fe72c8acc1a6ad4dba1abc28b62c98cec6c2c217`
`font_02_sfnt_off00010be1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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