PDF malware analysis — malicious · a970c2efa29fcab1

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 14:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 3b52e8f77e291784413e81ecbdabbb43 SHA-1: 69051cc33d69b70b354c1744e6740df5a7279666 SHA-256: a970c2efa29fcab1d9c77c2d3fed1d83288253e0446aa78fffd0614105cd122d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan indicate a likely intent to deliver a second-stage payload or facilitate phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=les+cestodes+adultes+pdf PDF link annotation
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e4cf797d48d1fe9c59e5835937c7e4f0/92770460989.pdfIn PDF document text
- https://talaa-obour.com/webmisr/uploadwebmisr/file/4045719247.pdfIn PDF document text
- http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manebitogeximamutume.pdfIn PDF document text
- http://nkland.org/userfiles/files/zekizaxed.pdfIn PDF document text
- http://csc0311.com/userfiles/file/20210620014945_8stdkv.pdfIn PDF document text
- http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/41628555715.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075694620589---zuwoxoji.pdfIn PDF document text
- http://baocaosuhoatoc.com/luutru/files/tezogakuboxorofubegusuge.pdfIn PDF document text
- http://93564497.com/userfiles/3123041174.pdfIn PDF document text
- http://stickerbarcode.com/file_media/file_image/file/87832030058.pdfIn PDF document text
- http://porpora.biz/imagenes/imagenes_contenidos///14337574730.pdfIn PDF document text
- http://recko.ru/ckfinder/userfiles/files/gavugibidekepoteguve.pdfIn PDF document text
- https://sanipacific.com/attachment/file/turekozusomikopem.pdfIn PDF document text
- http://deasreunion.com/clients/860224/File/budobuperogexatisonuke.pdfIn PDF document text
- http://sriagasthiyarastro.com/FCKeditor/userfiles/file/9658067124.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91a680bd94ac85121d3712fd049f0011/65279946031.pdfIn PDF document text
- http://gmkms.net/upfile_editor/2021/files/wekebebaxexija.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1c7159ef26---90262392739.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6e503910efbe45aaadd256ca78518f41/68780237285.pdfIn PDF document text
- https://limmaginebistrot.com/file/13315682535.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/95372767688.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089db079a9cd---80585715537.pdfIn PDF document text
- https://nacituran.com/userfiles/file/lojivivokumes.pdfIn PDF document text
- https://ikuseikyokai.jp/ckmedia//files/91793124636.pdfIn PDF document text
- http://drironcat.com/images/file/visunozaworulewovene.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_off0000e27e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27E	10376 bytes
SHA-256: `972fc385fb21b1464fb23ad4fec41f2356da34e96ef9506cc769f2ec9ace7624`
`font_01_sfnt_off0000fa28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001123a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1123A	19416 bytes
SHA-256: `1cf5314474c0326c1885aa8eb6b2f8a4b5a4d018ff17e6e6df6a1690e31df0e2`

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