PDF malware analysis — malicious · 657997e321774c99

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 03:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 4d80457473cdac0794b2014e34e49374 SHA-1: b15421e95d0619a00192bf76df2fa4e4bf352246 SHA-256: 657997e321774c99556662352a214e5f042bbda25894b3a10fb6deebb15dd7ad

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to distribute further malware or conduct phishing attacks. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9852

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
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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://jumpstart.mobi/ckfinder/userfiles/files/mopupobofumanewelimatatid.pdf In PDF document text
- http://nuraski.pl/wsg/userfiles/dijatu.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd18d0c29---54610866091.pdfIn PDF document text
- https://istocdukkan.com/userfiles/files/78513707398.pdfIn PDF document text
- https://actorconseil.com/files/file/12081517849.pdfIn PDF document text
- http://hotelbelleepoque.bg/userfiles/file/53649019831.pdfIn PDF document text
- https://taiwancy.com/app/webroot/userfiles/files/76001912640.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e87d1b58d3b9339071666370666f0be2/65154309386.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rmbfsfo2cl8f2qi95tq24ssnf2/40307088670.pdfIn PDF document text
- http://islandpointfl.com/userimages/66128742999.pdfIn PDF document text
- http://cuatudongsaigon.net/uploads/files/23357000175.pdfIn PDF document text
- http://slsnn.ru/content/file/82047088761.pdfIn PDF document text
- http://fcraregistration.com/UploadedData/file/vurebukalutifejofisu.pdfIn PDF document text
- https://candica.pl/ckfinder/userfiles/files/bagufipovekesubo.pdfIn PDF document text
- https://aznamaste.com/ckfinder/userfiles/files/diselabawolotukasoteza.pdfIn PDF document text
- http://dolphinegypt.net/userfiles/file/62880168424.pdfIn PDF document text
- http://orsini-blasioli.it/userfiles/files/99350393637.pdfIn PDF document text
- https://ariaparvaz.com/basefile/ariaparvazcom/files/1623575074.pdfIn PDF document text
- http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/21654656166.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4625158f5eab3811d0633d90ef6c79ca/92894913681.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/frbusg1l0jh8vjtmjrv2tu4npe/6665959106.pdfIn PDF document text
- https://efsanepin.com/calisma2/files/uploads/9474862493.pdfIn PDF document text
- https://costabravas.com/uploads/localidades/files/92668531491.pdfIn PDF document text
- http://zatexpress.com//upload/userfiles/files/pijuxes.pdfIn PDF document text
- https://creteservices.com/FCKeditor/userimages/file/57012058521.pdfIn PDF document text
- https://adian.eus/files/galeria/files/bavebamuwoxipiji.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=right+hand+very+coldPDF 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_off0000e909.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE909	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001011b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1011B	18376 bytes
SHA-256: `38464d61f4521d1b09d975341380c48d43ab153101ca325241bcf2e8dc8a1d90`
`font_02_sfnt_off00013034.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13034	10704 bytes
SHA-256: `dcb0fd1929983f5c565b6e7e0b0759ce4257fcf944d80ad727cd3dd762429d10`

Open this report in the interactive analyzer, or submit your own file for analysis.