PDF malware analysis — malicious · 56b4c6623d4ca787

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 12:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 837e3c97ec2170d564ecfed8dadd993e SHA-1: 01a0bea152a8a9e918866d9ca29818b97c2e981a SHA-256: 56b4c6623d4ca787fd29d0bc86fd07552a84e1a3ff081cdc2971ee44b127076e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used as a lure for phishing or to distribute further malware. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=dadsworksheets+fractions+to+decimals PDF link annotation
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bb857e3418129a3ddbcc5598feb2f98d/18415184612.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611790efc405e---mabimejusokorupofodupa.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbebc22030---5655294627.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910535a7fda---25187283629.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b633af85923d4b7ced3243160fd3a40/xezojuripizalelotuwibexab.pdfIn PDF document text
- http://footstepfloor.com/upfiles/files/xadagikuti.pdfIn PDF document text
- https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/3b75c5a7e33af8acb7b22d460030e8da/kovezim.pdfIn PDF document text
- http://parishad1925.org/ckfinder/userfiles/files/83471578158.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-6-26/20210626072822731663.pdfIn PDF document text
- http://bitree.net/ckfinder/userfiles/files/5956781351.pdfIn PDF document text
- https://jooli.ru/ckfinder/userfiles/files/8567129061.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/kajowesozaronepi.pdfIn PDF document text
- http://jinanxintiandi.com/userfiles/files/noribagopuvidawanujisaza.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/libqvr0r4eqjomdnbesoikk4te/dukewejuv.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098410f1c264---jelaseranagatufugadoka.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/u6vejpifiscpc5bvgn5o2pmtsk/vutuv.pdfIn PDF document text
- http://www.asap-recruitment.net/upload/file/luvexavabejukobemala.pdfIn PDF document text
- https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bb380b9d7fb34c0087f9335d81874a1e/supovikejuzupozev.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096d08fc1df3---73313603201.pdfIn PDF document text
- http://yameitecl.com/ckfinder/userfiles/files/20210710_030537.pdfIn PDF document text
- https://alaqart.atelierleuthold.ch/userfiles/files/31487297018.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/el744ocal795nruiqk9mnakto2/5341554717.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1f10ee68---21366661316.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5vik44n263d7dgbv4b5eb8e810/63343951134.pdfIn PDF document text
- https://hoongnau.com/upload/files/fanijejifunewu.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952d29d9d2---tojowujevaloxupafasujax.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_off0000ca32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e244.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE244	17324 bytes
SHA-256: `b68de851f5195db1e067c13466a92875ad271eab40b0800dfca7a9203d0d2a12`
`font_02_sfnt_off00010eaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EAF	10920 bytes
SHA-256: `c279feb913609d3adc3eb078ce36ce1652ebe9ab117692cbc1ce27b982f4a500`

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