Malicious PDF — malware analysis report

Static analysis result for SHA-256 25456162f42dd4f2…

MALICIOUS

PDF

68.1 KB Created: 2021-09-14 08:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 429480a150de6e5c3c6055155aeae9af SHA-1: 734bb65301c50f0dcdaba9d3935edeb35f66a213 SHA-256: 25456162f42dd4f2c999006d359d8115ecc22cf318001c7064f0e57b193e8bf8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing and trojan lure by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be an image-based lure, typical of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cafemocion.com/userfiles/file/65004013195.pdf
    • https://solidpractise.com/files/userfiles/file/36230253251.pdf
    • http://ventexevent.se/uploads/file/lexoxopawiwipusepisema.pdf
    • http://vietnam-intraco.com/webroot/img/files/toxafizivodukubo.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/pepebogirakedifuboge.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ee6dd7c6a0---josoduvekes.pdf
    • http://vo23.ru/upload/file/bolusulibitakok.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/54397650402.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/36458576990.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/bonozuketojew.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130741d9064f---wujarebamirutoranevibewak.pdf
    • https://traffictkt.com/viking1/uploads/files/65995473264.pdf
    • http://vln.nl/files/file/revojovogo.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/jexumunipotivefefujumu.pdf
    • https://ms2gacor.com/contents/files/vulitu.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51380146675.pdf
    • http://immopolignano.lu/images/39636457067.pdf
    • http://movesearchesuk.com/userfiles/file/68614868558.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d4de918---fusejapalixejeda.pdf
    • http://skpizzasubs.com/uploads/files/rajokujerimekolunudikaxuz.pdf
    • https://adci.vn/data/upload/file/kapomorazobedab.pdf
    • https://bunyaminerdemir.com/resimler/files/walopamuparokeputinewajin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+helper+for+android
    • 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_off0000b08a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 16792 bytes
font_01_sfnt_off0000c8a1.bin
d361cd7f96eef7949f20cf0b48c87875d2eb5c04f12b7befac806d9f4de17157
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 10416 bytes
font_02_sfnt_off0000e017.bin
f4ec9282c12d7d4ceee089db91cdfb06bca05f085785223a017fb41e2a1b200c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 14060 bytes