PDF malware analysis — malicious · 8ec0c84231e967ba

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 17:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 86217af33942ab610c584250efe62e10 SHA-1: bc8d40d9f549e7e53f9cef17e3643c9451a070de SHA-256: 8ec0c84231e967ba9d64ba68e19d67860afed312f725795dbd99e8e5a15e6d3f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites, which is a common phishing or malware distribution tactic. The presence of external URIs and link farm heuristics strongly suggests a phishing or credential harvesting attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://philabc.ru/uplcv?utm_term=download+cheat+zombie+diary+2 PDF link annotation
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ec1bed01---wovape.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/dmf7jhp01h77es9jkr5cdeg2r4/zetesogebelonogerojedon.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9392d539b462c09f56f9dfd93bf3a3df/48194095066.pdfIn PDF document text
- http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xezugetozejaxove.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a62ddcf3b---44242490616.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k5csovdvdvnhu5iuf6gc2sorc3/73515147134.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b62777d6fc0---40867617783.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8bmps3ts3nqdhgi3s9e88l6ued/mitufipi.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/69106306085.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3uimsospf780h57qfr2ofgvng/basuvulopoza.pdfIn PDF document text
- https://digireg.org/upload/30740454180.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aea01b607---pewubilegozefogeno.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff2da7d39---botabedudak.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4aece028b5a85b685aee6907f6e8f8f9/zamunelitizepudowofoxa.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1feaba1ba4---3163065555.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6f093ffa7---69099435155.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4599f61b6bee30688caed876c4d95a97/ruduparufasonisop.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896d28545b---wabojafilewoj.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738332038ed---tapofetuzematav.pdfIn PDF document text
- http://tochalco.com/uploads/files/goveludu.pdfIn PDF document text
- http://imi.vc/upload/files/wisalimokunena.pdfIn PDF document text
- http://beerskiboot.de/img/upload/file/81475782919.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6b3a049c05523b5c4011886d6f3ec16e/2137147480.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b9a33d2---5629507107.pdfIn PDF document text
- http://toshiteriyakiburien.com/uploads/files/genikodimutugijowusonile.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e78f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE78F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffa1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFA1	16124 bytes
SHA-256: `ec99c55b32e4ee93103d8e8eb6f6da362a535f297462a068a223a9424bb0832d`
`font_02_sfnt_off00012980.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12980	10988 bytes
SHA-256: `69fb39dd645aeb30b75c48e13c9c1b1fd76daac15b4ae449c750ce2ef1ea1343`
`font_03_sfnt_off000142e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142E1	1700 bytes
SHA-256: `15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8`

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