PDF malware analysis — malicious · a1c514f4f8436c5b

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 04:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: cbe8d996b179bcb69b91b1d281df86c2 SHA-1: cfa46e39422a545f8c5c815e9e9be160ed6da290 SHA-256: a1c514f4f8436c5b1e118fefc8af183674fa04f993d49652356949fccb6bff48

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF also contains numerous external URIs, many pointing to compromised CMS uploads, suggesting a link farm used to distribute further payloads or redirect to phishing sites. The embedded JavaScript likely attempts to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://crysiq.ru/uplcv?utm_term=exponents+review+worksheet+pdf PDF link annotation
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9438891af---95610753279.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/23ab7d2e3b3aee224c3a97a93e986246/zotekikok.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d0f569377f3eef978e854ace9eb1c2d/98908294886.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01bea5622---bapugikazapemutaz.pdfIn PDF document text
- https://hnhaa.com/userfiles/tnejp//files/kojofajaxodu.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/visudag.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0etjh2rmd5qgp51fmekhm3dva5/figidad.pdfIn PDF document text
- http://uralcomservis.ru/crn_fls/crn_files/nasatilobumepe.pdfIn PDF document text
- https://treasurehunterdetectors.com/ckfinder/userfiles/files/4307550803.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61170a8c59---65763405514.pdfIn PDF document text
- http://ingpiazza.eu/userfiles/files/wupeditijapekirubixa.pdfIn PDF document text
- http://kino-cosmik.ru/sadm_files/80429348524.pdfIn PDF document text
- https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kafumuzix.pdfIn PDF document text
- http://hasici-pristroje-eshop.cz/files/file/44308898704.pdfIn PDF document text
- https://volandovia.it/public/fileeditor/file/98805968447.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7jjsvaha16um0tpcthqf24o7d7/monuwedekigofewa.pdfIn PDF document text
- http://sevoir.hu/uploads/file/lowuwegelazeladuriwenug.pdfIn PDF document text
- http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/25203552109.pdfIn PDF document text
- http://luingpyrex.cz/foto/Image/file/dinig.pdfIn PDF document text
- http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/webolatoduferedurokib.pdfIn PDF document text
- http://briarcliff70.com/clients/874901/File/256227164.pdfIn PDF document text
- http://tpdw.pl/userfiles/file/difulewu.pdfIn PDF document text
- https://conexusinternational.com/ckfinder/userfiles/file/pokujon.pdfIn PDF document text
- http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/81674807583.pdfIn PDF document text
- http://didaconcept.com/admin/fckeditor/file/28904901299.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jltigjs1o0oetmrk7rvbmgk19e/58159612345.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_off0000da80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA80	16552 bytes
SHA-256: `a8f09641dd311d3e9b399e90280f770535bf2ec0445b2afc35966a2503dbb919`
`font_01_sfnt_off00010551.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10551	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D68	10716 bytes
SHA-256: `dacbbe0ce6090886356281fa00d3bda81156f4d116114b5ffc7259f851292c6a`

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