Malicious PDF — malware analysis report

Static analysis result for SHA-256 daff54cb5fe43494…

MALICIOUS

PDF

72.2 KB Created: 2021-06-26 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab5989c7c3f6bd8e5897e06963a6e3a1 SHA-1: a8d84e8fe64ea2bad6efce776c135b2a89d380dc SHA-256: daff54cb5fe43494ee741cbc28163526a84f54dd6fecd8942e411bf7377be53a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it is intended to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=boat+house+brokerage
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ce7af90c---79688373396.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3d35fc3b3ae6f1c7f6746757163d7077/juvalelakekugepix.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f3796056---potoxik.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ca9d4a5daf7fe3d00cb9967537c5ab0d/lejupolulabazulumi.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/653b2db8402f44e2e888063af3c72c2b/67076335098.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/jivefiradovimujore.pdf
    • http://kovacsoltvaskerites.hu/images/file/74961452304.pdf
    • https://festival.bg/fckeditorfiles/file/19667575292.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6fa2f784783bf28cbe53891ec2c4ff52/5779944594.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609019d8ac0ae---genavudedelavunatob.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/500ffa7436de1231824f7a0ee2738fef/midejetowunibadid.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc049185c60---pojufanudatuwug.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4cc24aad52204ae2ff8fde188efcf7b0/79363106823.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/dee0c8f1d71fbc59ac7b73e691f406c8/66997086253.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fa2da692a98e1142d770029bff058e2d/rinawuriwupewimi.pdf
    • http://munsusa.org/userfiles/file/20210626113718.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7bd8830c8.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/miig35v264n190a8vdplfhirqa/jeditejix.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/44059064489.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/79e4e1915d1a53d0ed8384fd9199a95f/xomen.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021516628342148.pdf
    • http://stonestudio.pl/files/upload/file/27123825335.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/logidekatut.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/fezaxi.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91f596ab1---15566542707.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd80.bin
5f5822bcd11a2aaccf7adb76f34a5d6ec9f11b6888279bba7b6807eec690bad3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 15220 bytes
font_01_sfnt_off0000e372.bin
7a63b7997b005a4a13fe169e8085dfc7f08c8dfaf2c101b37f4ae1e076abeda7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10532 bytes
font_02_sfnt_off0000fbad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 16792 bytes