PDF malware analysis — malicious · 944a950043f11fd3

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 17:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: be8cc355f7b3edb1ce3fffc5e83dd3a2 SHA-1: 5fc9794776349882c8082d11aab27804a7b57b01 SHA-256: 944a950043f11fd3e1b3ddbba62d27eb303c213f4bdcde08bb5fd8b32c0487fd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of multiple external URIs and link farm indicators points towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=pc+picsart+download+windows+7 PDF link annotation
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3cf8e035---voduguxitugafukukebozo.pdfIn PDF document text
- http://mintaialuminum.com/d/files/julekeziripokorusibi.pdfIn PDF document text
- http://daedukgs.com/admin/fckeditor/data/file/20210914195600.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/356337928ce74450d4b1a3c82544ff87/29913251271.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd4d8c7da---nefitedakukef.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0v3kv9i1t89tc30jhe9fl78toi/wunupolezoverexudi.pdfIn PDF document text
- http://pharmabiosolutions.com/filespath/files/20210919192822.pdfIn PDF document text
- http://meandnetworking.com/ckfinder/userfiles/files/84424529221.pdfIn PDF document text
- http://iscelenie.info/files/file/50276251907.pdfIn PDF document text
- https://ms02bet.net/contents/files/9892894454.pdfIn PDF document text
- http://geometramaurotozzi.it/userfiles/files/30981995926.pdfIn PDF document text
- https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/47547646950.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cb7e491aa95b1f61254cacdca09f813/modubexisuwesagojedakid.pdfIn PDF document text
- https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/gafumiladizivumogudowi.pdfIn PDF document text
- https://austdoorcaocap.com/upload/files/raxurujidusilu.pdfIn PDF document text
- https://cakesandcupcakes.net/userfiles/files/25267905694.pdfIn PDF document text
- https://simon-daulte.com/ckfinder/userfiles/files/gebateviwora.pdfIn PDF document text
- http://architettorobertafasola.eu/userfiles/files/goxovaduxobaxibu.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465815461f2---leketugaregunusupo.pdfIn PDF document text
- https://sistemagestiondpr.com/userfiles/file/32369187011.pdfIn PDF document text
- http://ambulatorioveterinariomariani.it/userfiles/files/12351261798.pdfIn PDF document text
- http://stoka-saarlouis.de/userfiles/file/wifivapina.pdfIn PDF document text
- https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/41116362752.pdfIn PDF document text
- http://eternoohydro.com/d/files/monidikolifipigejo.pdfIn PDF document text
- https://shatalarab-llc.net/userfiles/files/nibaduwidajevig.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_off0000de9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE9F	17312 bytes
SHA-256: `a7aa9225a0f71c194bfbc6bdd7cea56274cd76174b2de0c7c6bf97fd3e7179f2`
`font_01_sfnt_off00010af6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001230d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1230D	10512 bytes
SHA-256: `64339bfdd93a3299d9537532a77f3dcb24ba56a273c88d1c5f981a8ba7333678`

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