PDF malware analysis — malicious · e687355484020161

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 01:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 9a3a98a94544eac80b67ff1c6e7c291b SHA-1: 94fe51a318ea6c611b02a45788bbfae699ba33a0 SHA-256: e687355484020161f84ffd4d0ce9e648ee3925429d7c6a4206e6e4dc37077c78

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive users into taking action, likely by clicking on one of the embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://laborke.ru/uplcv?utm_term=does+orange+and+green+match PDF link annotation
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35a4e36ea---20554740526.pdfIn PDF document text
- https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/xagutozudavegivonu.pdfIn PDF document text
- http://vandervalk.reviews/app/webroot/files/userfiles/files/bazinewolobori.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099252f2a80d---tapesuzexusilolibisowev.pdfIn PDF document text
- http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/liwiwoxokopufaxud.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c488761745a---laseparuvusowikoweriwido.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c77cc595c---54462812654.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e4d334f8---20403126189.pdfIn PDF document text
- https://cualuoihoanmy.com/uploads/userfiles/file/kozinititonigotava.pdfIn PDF document text
- https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4a10eeaf---31594008188.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/betazibudaxi.pdfIn PDF document text
- http://letresorellebio.it/userfiles/files/sakuke.pdfIn PDF document text
- http://msamerica.net/clients/873634/File/39159997070.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7igcm1usi8c0h3j3890hofid1r/rozezegijujewopon.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3c9ceae6f1f47e80df9eb12477e3240d/begufakinogogiwidemim.pdfIn PDF document text
- https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c87aa9b4599af250c718223ce4e8907c/lututifowuravagu.pdfIn PDF document text
- http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/zexulerinamun.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gt0rcoib3vo8rbhieg048qvves/62488770337.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3cd2598a---pidifebitezedobipevu.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8899a176---dazotejizum.pdfIn PDF document text
- https://akapacha.com/userfiles/file/43551651312.pdfIn PDF document text
- https://lesura.net/userfiles/file/74121500466.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094805f30442---71640820158.pdfIn PDF document text
- http://s-privod.ru/userfiles/file/jexawasevobeduz.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3ea40b88544f83e451a14c61a2ea5d1c/sesapivixalodasa.pdfIn PDF document text
- http://kagoshimakojintaxi.com/userfiles/file/xitusosivaxuwekisabefo.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_off0000fccc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCCC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000114e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114E3	10680 bytes
SHA-256: `7296cda551726e06814614eb9f463a8df98c5cd19c8abe4feab7e55de4dc3ca8`
`font_02_sfnt_off00012cfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CFD	18024 bytes
SHA-256: `f01ec984368dd34fbacb4c77e24078440be7f87345ee44f51258e88bac57a8f6`

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