PDF malware analysis — malicious · c57b480804c357a6

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 20:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 7625df634b39effa51e2ccc4ad0b52e3 SHA-1: 66bcd7a3adbe34aba3d08b3c280acff7468376df SHA-256: c57b480804c357a6f37e6158ed996919d0cda969b6c452e0049ea28792b76e23

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=super+bet+apk+download', suggest a lure for downloading applications, likely a phishing or malware distribution tactic. No scripts were extracted from this sample, but the overall structure points to a phishing or malware delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=super+bet+apk+download PDF link annotation
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613669f2730d5---39170693040.pdfIn PDF document text
- http://bolt-go77.com/fckeditor/userfiles/file/17847899629.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/gosizupaxorikilupexovira.pdfIn PDF document text
- https://asiantms.com/ckfinder/userfiles/files/64648694879.pdfIn PDF document text
- https://client-sms.com/ckfinder/userfiles/files/fazedebaxig.pdfIn PDF document text
- http://topspeed4wd.com/ckfinder/userfiles/files/93744607141.pdfIn PDF document text
- https://derechosenred.org/aym_image/files/83493902482.pdfIn PDF document text
- http://malopolskiszlakwinny.pl/upload/File/79145474783.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5lgcv4e5phsfakd5b3558isepq/71992665469.pdfIn PDF document text
- https://nacionalequipamentos.com/ckeditor/uploads/files/pituxejekopodapopugadif.pdfIn PDF document text
- http://premo.at/userfiles/file/42647248051.pdfIn PDF document text
- http://angel-conference.org/upload_fck/file/2021-9-11/20210911171801985996.pdfIn PDF document text
- http://www.tobywells.org/media/fckdir/file/munejipe.pdfIn PDF document text
- http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/rofosizilinewaponor.pdfIn PDF document text
- http://baiduvpn.com/upload/files/51955938016.pdfIn PDF document text
- https://cafesca.info/ckfinder/userfiles/files/xogufivasewuxafajas.pdfIn PDF document text
- https://rubyyadav.com/nbloom/fckuploads/file/domuvefejigudofix.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb93979c81---46526116460.pdfIn PDF document text
- https://pacpartner.net/images_client/imagesfile/57482734511.pdfIn PDF document text
- https://visualarchive.bg/files/jogutuderabafi.pdfIn PDF document text
- http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/lumuna.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/215c9a365621309560f1135dcd8ca13a/wewog.pdfIn PDF document text
- https://apteka-wratislavia.pl/halatecza/userfiles/file/52637829146.pdfIn PDF document text
- https://middletonchambers.com/ckfinder/userfiles/files/15446073286.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_off0000d161.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD161	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e973.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE973	17472 bytes
SHA-256: `b01ba57da76ef1745faa468f829b51c9f1385b8511e459b2df7ddbd3826abcbd`
`font_02_sfnt_off000116fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116FB	10620 bytes
SHA-256: `f69bb86e9cec8b9ad2dfc57b06d391fc71d72dcabe1d52be39ef889fcfe949ad`

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