PDF malware analysis — malicious · cb3cb1a9aa6d6b20

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 05:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: cfc41ba642c1f819529a8f06ab99c5ad SHA-1: 23a8d5243bd4752c7185c2e01f5e60482f87df73 SHA-256: cb3cb1a9aa6d6b207b509dce5aff4dcda8577738d020c74a8a65ef878e87efbb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links suggests a link farm designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://garglob.ru/uplcv?utm_term=good+automated+manufacturing+practice+pdf PDF link annotation
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825fd95f98---69291220089.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc4c5ca82---70650071154.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a340722a0b---3441557042.pdfIn PDF document text
- http://astorandblack.net/emailer/userfiles/file/33306360506.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089863ef0d07---molevisubek.pdfIn PDF document text
- https://cafepiolho.com/uploads/assets/lilavomumotasatijesiw.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b4b23b7---redisalekokokiwosefuje.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ftk2avsrsq3qesqnn8ev36n6j4/86261557776.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927ee3b49b---tezafawunozemijidelazoj.pdfIn PDF document text
- http://dekoblickfang.de/userfiles/file/lujakuv.pdfIn PDF document text
- http://ettermanenterprises.com/ckfinder/userfiles/files/nunosarijati.pdfIn PDF document text
- https://olympicwroclaw.pl/zdjecia/fck/file/1269959433.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b7cec1cd---subokipasozokugo.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a3705862030a033d819d0ecf223f7000/76590124904.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8d1367ec---tovusetuposukenirito.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mam8fvu1qoeqf45ao13rpkr1bv/tulop.pdfIn PDF document text
- https://saatyapi.com/upload/ckfinder/files/dizogoravupudijozugedu.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/wolapolilokosuvum.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b921de34---81546660180.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2dd4d014e1835194df7b9fbe843e8bf7/dojeveworabovuzusin.pdfIn PDF document text
- https://ropaalmayoreo.com/images/userfiles/file/31958378759.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba32b67b52---badunepevelifilafup.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/aguked9d0rj9r4gnrg68vnjcar/ragipa.pdfIn PDF document text
- http://zae.me/datafiles/file/rinifuxazoriragafuk.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089570a569---39003507650.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1ded823e048ba122a22f27b69e582344/lawixufotak.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_off0000ef86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF86	10888 bytes
SHA-256: `42190a45bddb098d1fab609082ec9247f4fb70454867f6cc519467c55ddb7b8f`
`font_01_sfnt_off0001087b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1087B	17036 bytes
SHA-256: `456163c6280d44c6be2fd50e694c2e8cf1673c9b5213e132a98ef6dd1265ffc5`
`font_02_sfnt_off000134f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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