Malicious PDF — malware analysis report

Static analysis result for SHA-256 614077c50000c800…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 11:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 808e144e542ad59fef764a6049b89a7e SHA-1: a0b8d00e45e064dba8da2689fad0e703c65ec1b9 SHA-256: 614077c50000c80028ee8069eb03c3a5970771b8cd409f5233d5d4f6e692278f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form link farms, many pointing to compromised WordPress sites or disposable domains. These links likely serve to obscure the final malicious destination, which could be a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=windows+live+movie+maker+2019 PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aef7089d0---xitegakodopajavud.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/nudawan.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/wuladowip.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903031207.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/womusuzosaxevomuxuvuj.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/73329628703.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8cfd09263771ca1f5d8ddff66a928c68/rejigajolexika.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/93232580034.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/23225505722.pdfIn PDF document text
    • https://atrax.hr/files/7997622703.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/savudiwuladenasugulaj.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/tepemotusimuzememoxegonad.pdfIn PDF document text
    • https://grandegroup.net/files/54616567723.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/53494895984.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/tuvabawuto.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cda1816783ad36ef97e7677c0ed7799c/muwisilegogimivipokubajon.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/70301088651.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/24670628515.pdfIn PDF document text
    • http://briztravel.com/upload/files/66757766428.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/tumab.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/4851590201.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091214540170554.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/vopomisamubobax.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/89085923690.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lodoveravujulaganuf.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/18029565150.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.

FilenameKindSourceSize
font_00_sfnt_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 16532 bytes
SHA-256: 64d9e95b77cb892f6f72c0bdc69c94aa2cb59ea825fc4d54031001cd21277e50
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 11012 bytes
SHA-256: 716d3862bef17bc63f37de4ea9561c951069d34bcf2ecec376cfe3ba8219bd16
font_02_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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