PDF malware analysis — malicious · f84a0f1fe6102abd

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 06:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 67ddc056d03c3aa491448e09e4005c84 SHA-1: e74f01dd56f7da6f6a10eb580f27b4d571c0e0a0 SHA-256: f84a0f1fe6102abd420dec5716640b431e89d53476133e38d9dcf2ec824d1f06

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous extracted URLs point to a malicious link distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://assushop.com/userfiles/assushop.com/file/jinubanasezijikibuvi.pdf In PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609099393ab3a---vejabitezul.pdfIn PDF document text
- http://naturalmis.com/userfiles/file/talinapopotidaraduzoto.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/piwujogifobuxa.pdfIn PDF document text
- http://fluorescent-training.com/file/tejonarepatawutigogefefib.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/68a460aa52d870d95ca5df082edcf33a/59699960258.pdfIn PDF document text
- http://schroniskoorzechowce.pl/ckfinder/userfiles/files/beroburuzuporeganujaxuno.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/tamaj.pdfIn PDF document text
- https://www.grdr.org/paidel/ckfinder/userfiles/files/topizanakolasogegegi.pdfIn PDF document text
- http://chickendaylacrescenta.com/uploads/files/30852672950.pdfIn PDF document text
- http://ms-domino.eu/images/file/files/fobajabop.pdfIn PDF document text
- http://daeryuhealthcare.com/ckupload/files/63200051950.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129aa1fd9bd8---37158158533.pdfIn PDF document text
- http://irvinenott.co.uk/ckfinder/userfiles/files/mexununupowakoboditakil.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9704234df0b638111a05292b541ca736/16519968195.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/94588884326.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f8535c50a89a9a829c6d52a1d8fe9fdb/faxixuwinilexaku.pdfIn PDF document text
- https://turbooto.vn/upload/files/sewujapepixerobugotuxaju.pdfIn PDF document text
- http://yangpupark.com/uploadfile/files/30544120803.pdfIn PDF document text
- http://abwmechanicsville.com/uploads/files/molesoxoxupajefa.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df462ca52---50237978220.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16127804782208---jiwibuguj.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pnbj19t5k3j7feg7vrj22f47bh/66614185767.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/1ebmd75ofrl8iiinc5pjq9p2a0/bodabegexuviladejolaza.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098432844814---sowapef.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa01095218---74364779049.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=energy+storage+and+transfer+model+test+answersPDF 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_off0000f2cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2CF	18668 bytes
SHA-256: `651eb94d5717e5a924bc5f3cb728d2a6cbcc25b9ae7c6688f331e255acc6be53`
`font_01_sfnt_off0001226e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1226E	10788 bytes
SHA-256: `0c6e89f2e3721c05b737ebc735437614bd2c174d403babc5bb06797bbf372fae`
`font_02_sfnt_off00013b2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B2A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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