PDF malware analysis — malicious · 113e11f2c79edb0b

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 16:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a435388a48be2c88be0f7415bba3c22d SHA-1: 171f8d327e9978dad904e0ceef426d8d3a29f3a9 SHA-256: 113e11f2c79edb0b8177d683ccc700e470a3f9f2e54b32306660435a18fc39ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. One URL, 'https://queure.ru/uplcv?utm_term=dremel+4000+user+manual', is presented as a search result for a user manual, a common tactic for disguising malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://queure.ru/uplcv?utm_term=dremel+4000+user+manual PDF link annotation
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d2aeb3bb4---17923629221.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6b3c13804dbd5a5890ecbe6eb13144ab/jegaxesolexo.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ad0e262b6dc0a0545a86911229c7f020/kisexesox.pdfIn PDF document text
- https://sofupingame.com/calisma2/files/uploads/tamotoleresodu.pdfIn PDF document text
- https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/96651629493.pdfIn PDF document text
- http://okfilm.kr/userData/board/file/79368083722.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3hbl3369mq0rvgu6ig4mtq3gin/femune.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612064e77ba93---27244900591.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c988bddd59d24e1249d11aa8de7cdb4e/48242224600.pdfIn PDF document text
- http://wasserburg.pl/userfiles/file/14492881946.pdfIn PDF document text
- https://s-serviss.lv/userfiles/file/44485618127.pdfIn PDF document text
- https://airflow-skateboards.com/upload/file/36638363404.pdfIn PDF document text
- http://iglozawiercie.pl/zdjecia/file/40255361628.pdfIn PDF document text
- http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73377909202.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j700ft5h9rq3n0iqanvg2lil5q/lekuvesexiwurekebibike.pdfIn PDF document text
- http://re-view.online/fckFiles/file/73299816714.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dbb5695f50c7b91e9503b45dd03db350/95523291053.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/573419c531f50948da4fac13947f919b/rewuvozobaka.pdfIn PDF document text
- http://netcentricnj.com/ckfinder/userfiles/files/getisaguwetazubaluxirux.pdfIn PDF document text
- http://bkht.vn/userfiles/file/lirokamusobomamuvadas.pdfIn PDF document text
- http://santabruna.cl/upload/file/kexax.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd10001dc---83556330944.pdfIn PDF document text
- https://novzelandiya.ru/ckfinder/userfiles/files/27913484314.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dd4f0b0864c8d8fe706713cba2c7426f/56641542735.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnuop8qsdpahv57shlel7fruk0/15557516436.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b1ad7arahn0v8j0u8f5eva2v5n/vinutop.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_off0000e73f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE73F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF51	18400 bytes
SHA-256: `6745fec33e69e0415c90117fede9c8b634c4ca9e42190dc3f7d20cd24d1153e1`
`font_02_sfnt_off00012e39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E39	10260 bytes
SHA-256: `32ef59cf954599e00db1711de5645083254bbdd843afec4cb511db725e6e8f73`

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