PDF malware analysis — malicious · 807c7630a101b73a

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 07:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f7d46ec10b825d3542feb458f871d1a1 SHA-1: 12b2e642ac3d40306388b612bca9588e7c697c23 SHA-256: 807c7630a101b73a72e2120882ce1eb31c21ad19fe51d066841aee416aa5c08d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=method+overriding+and+method+overloading PDF link annotation
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4b16f5e8f2583708343653ed6bcbe5dd/fuwafibipijodiwipogim.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r3i5b416kps05rgk9tfrecrs4f/rinododibajexazapifelazu.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/wudabagaduluxonukebakulap.pdfIn PDF document text
- https://windsbs.biz/files/file/63994270671.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cdf9d91b7---47437083376.pdfIn PDF document text
- http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/91315073576.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c9b6a81ecc98b24a0d7c626f37cdccd4/ditiravujodisiwixekeb.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aad74ce34---kokubedikunebali.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4c923475---vobozafenirewir.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaca9ea23---21535078338.pdfIn PDF document text
- http://rajasthanmetals.com/userfiles/file/tofinubananebojogun.pdfIn PDF document text
- http://langfordfinancialservices.com/userfiles/files/bonugigafikifanogumelimu.pdfIn PDF document text
- https://h1t-urlaurora1-turbo.com/contents/files/tanizo.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160776cf6d82c7---todeje.pdfIn PDF document text
- http://ashioke.com/images/library/File/jewelavetoleragojunakis.pdfIn PDF document text
- http://chiesamadremarsala.eu/userfiles/files/12325192145.pdfIn PDF document text
- https://rosenstein.lu/userfiles/files/15575466829.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d8172171f7547b48f6cb211b72d44226/keludizabu.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f855281962---babomaxa.pdfIn PDF document text
- https://khonggiansachhanoi.vn/uploads/files/bunuwotuwiro.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a484456e37---63357640022.pdfIn PDF document text
- http://gyorszol.hu/userfiles/file/dasalel.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7c426a18d6fa874c2601b003d3b3f88a/poxadadegumubup.pdfIn PDF document text
- https://appvid.eus/userfiles/files/nabigabubafo.pdfIn PDF document text
- http://numere-mopede.ro/mm/file/85061644783.pdfIn PDF document text
- http://cosonhuath.com/hinhanh_fckeditor/file/49362357392.pdfIn PDF document text
- http://a2itsolutions.com/chop/multimedia/userfiles/file/64219598659.pdfIn PDF document text
- http://biomassasia.net/data_ed/userfiles/file/19173551917.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_off0000daf7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAF7	17932 bytes
SHA-256: `2eb0212b0d89bbd12d925b4d6e194cd5e3d7e578a98c4af71f6fcb29e00f1a0c`
`font_01_sfnt_off00010a24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A24	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001223b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1223B	10588 bytes
SHA-256: `fd9a67e6e04f6d9ed3af2d95f97960642c7bcb19d966e1e68a48b8c817572fa0`

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