PDF malware analysis — malicious · f7b581df8876e39c

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 08:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f98287ca4f5e0da141329abc8beb0097 SHA-1: d5da05988d19df04b4eb21c0d8f432a0bd5517f8 SHA-256: f7b581df8876e39c5b1ef0111591938ea66e177574fd9354f6d87a2624b9bdb7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-redirect attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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://krisoc.ru/uplcv?utm_term=english+collocations+in+use+pdf+free PDF link annotation
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8bdd8fb71---80008860024.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/lokunuzidake.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/624da1ec5809d15bf0545f501c73399f/bewapexat.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pu77ktk3i8itm92k7rn1nlg9mk/3128226043.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/9269323572.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/us8673ljed0c24n6fmqd3eb6vc/69456249915.pdfIn PDF document text
- http://educaholistica.com/resources/img/imagesck/files/89334709151.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/lewupupipadejuxezo.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b16b0e92e---fobasuwuvadojuzoveled.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb4d8cace---bapuv.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ama3pfpjtfh7ttnj65khtgupbs/62130989411.pdfIn PDF document text
- https://hongming-eco.com/userfiles/file/98751723095.pdfIn PDF document text
- http://vietthanhstone.com/images/news/file/melur.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef1045a08---5684290770.pdfIn PDF document text
- http://dichvu12h.net/userfiles/file/setiwivudibenojosewefoget.pdfIn PDF document text
- https://wisserarm.nl/app/webroot/files/userfiles/files/77152005687.pdfIn PDF document text
- http://mazdooradda.com/userfiles/file/detuguxidiluv.pdfIn PDF document text
- http://dekoblickfang.de/userfiles/file/58858219617.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7cldhve6mqb68ek9ll9pvs5477/59946231349.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0e82679f---vovexusejufakatogetazonal.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/kukeberavof.pdfIn PDF document text
- http://gzmingjun.com/uploadfile/files/20210826_170720.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/90754100930.pdfIn PDF document text
- http://dga.gr/ILC/img/file/96584075552.pdfIn PDF document text
- http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/99007006735.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_off0000cf31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF31	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e743.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE743	17452 bytes
SHA-256: `34e12e5db43b8b462d07bdac17339fb8cf2d61ab11adb5731fa783fa79933687`
`font_02_sfnt_off00011432.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11432	10980 bytes
SHA-256: `2c6daa3979f43c86b79f9c8e1e72c26f4d88118efdfc5f019ef46336637af590`

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