PDF malware analysis — malicious · b3fd124d1d016063

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 744e7e8f9e5681fbf8f45d455f8d65f1 SHA-1: e5cbfe27be84ae7bb5e0a51d461d4bae78953e9c SHA-256: b3fd124d1d01606303cb4c24f0721deb6aaa992a979277dcc28b9c4cc3154aa6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=math+division+worksheets+grade+7 PDF link annotation
- https://medsplus.us/admin/images/file/fibugisekasan.pdfIn PDF document text
- http://www.huntsvillepr.com/files/files/pidotorisesirusigikigu.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3ba980e8---61310076692.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ec9b14b6---lipumovixatafujito.pdfIn PDF document text
- http://wsm.hk/images/files/96715361299.pdfIn PDF document text
- http://arci-mp.fr/admin/File/zepipofotedupekelewedok.pdfIn PDF document text
- https://partnermind.cz/images/files/10149419298.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbae7dd6e2---buselidoluwejesur.pdfIn PDF document text
- https://bselink.com/userfiles/file/miwegiwajifamijilibet.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/85406139012.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8025bffb---47224183139.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/zedomepolegomutiwu.pdfIn PDF document text
- http://thaisomboonautopart.com/userfiles/files/80836631306.pdfIn PDF document text
- http://wtmongolia.com/materials/file/pevuboxutunivapu.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135edc279f05---78749961713.pdfIn PDF document text
- https://www.gico.ge/ckfinder/userfiles/files/ganupexiremi.pdfIn PDF document text
- http://aps-mes.com/files/file/lojuxetazijiwok.pdfIn PDF document text
- https://armagedonspedycja.pl/files/file/gazanogetovijurudonijano.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_off0000d54b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD54B	10768 bytes
SHA-256: `9797af859b6d591805483bf4bd2e4824014eaf3c619f81521c2845dc08f06d28`
`font_01_sfnt_off0000edf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDF8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001060a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1060A	17172 bytes
SHA-256: `d6ab0101a001d7056efa1d75040125b2b4fda127fa437ed49e4879403f107689`

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