PDF malware analysis — malicious · 73bf6c3cef495e7c

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 04:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 8145b5616e5eb269aca325f133d34ddc SHA-1: ed344a7abf54701a0be09aef11c9d23c67d7a390 SHA-256: 73bf6c3cef495e7c4aad56592f9b5dbc00149cbee5dd6705ca37fee110544eb5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the ClamAV detection further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://synerhu.ru/uplcv?utm_term=application+for+recommendation+letter+from+college PDF link annotation
- https://lescourailleurs.com/upload/editor/file/30082179141.pdfIn PDF document text
- https://actorconseil.com/files/file/89601274731.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5995b8e77c---37433705368.pdfIn PDF document text
- https://alihuata.com/userfiles/file/jinapikonomo.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160878186ae83e---nalonaguzomemegolabunel.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b497878160a---farituxuwog.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087dea6ac83d---57270111789.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da8606ee6---fotukexoken.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/27507592361.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b16b1153124dace0e6ec6bb42639b731/gamakunijogut.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/ladojekiwuzozolire.pdfIn PDF document text
- http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/jewudutazesure.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c64a5a214---14702582939.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0066e9f658---kiserazaredudewofefuz.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/75127a3d7fe6c3431348d80fe46cbed5/57861772942.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa911635de---tadijakagotidub.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a5lpequ0dnlenc16aslffiugv5/96844866345.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/683213b57188bd61e95a042657c91e85/toronawefifi.pdfIn PDF document text
- http://tamker.hu/userfiles/file/xutevedafiz.pdfIn PDF document text
- https://btegypt.comfile/59316784486.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/84i017hdn049ini1s86tsgs2eh/kugutoxegebozemer.pdfIn PDF document text
- https://2acontractor.it/images/file/pugadikovekefoxufugu.pdfIn PDF document text
- http://atomleasing.ru/media/File/nuserozirijazigitijumefij.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6510221b8008e78ae32ccaf7da127c9d/sovobutepodevox.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfdfc1626---gukabibi.pdfIn PDF document text
- http://mwflower.com/upimagesfile///juwesikapab.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_off000101d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101D7	16320 bytes
SHA-256: `42ee1032bf398476203d7b186a02fbcf8024c5524f255f47f7484b2c14367cea`
`font_01_sfnt_off00012c0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C0A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014421.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14421	10776 bytes
SHA-256: `c88df3f123bd85871d98df915178ff500fbc5f547e55f065507ddcf51a0ca69f`

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