Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a124ea9c90fb90…

MALICIOUS

PDF

84.3 KB Created: 2021-07-30 21:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 020545a9cfafdd284dee21b05c56c47a SHA-1: bace2296dcd7e9205c0cb22b7db3b730131fcc4a SHA-256: f5a124ea9c90fb9022e1eb561b1c0f5bcc594269a02763abc6e1d72ac157c5f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. These characteristics suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/26734010174.pdf
    • http://hykylalumni.org/userfiles/xabunit.pdf
    • http://wedooverseas.com/userfiles/file/gojamifukewevupupakajam.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f7e243528552e8e7c2c1447f0f111ba1/14577830105.pdf
    • http://efuegypt.org/userfiles/file/lerosubesuvikafilon.pdf
    • https://pathakpharma.in/singhania/downloads/file/41911238341.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e32d66bb0---10668520554.pdf
    • http://carscaso.com/js/upload/files/53421827107.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6821ea40ba---sevove.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hasbk3ki3ia6r72gvilt8jf0l1/rifajopojomopukemijejox.pdf
    • http://mamam.by/upload/File/file/22318393850.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/sutafifepenenonama.pdf
    • http://nationalcoopadvisors.com/userfiles/files/wovujuza.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/841a3dec20831bf0cda20d9ce0dc6913/71089735645.pdf
    • http://autosoftware.company/autoresponders_images/files/12713221776.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160839e59170b2---rabaviginudepuxetapunixad.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/rudobemavujojinixus.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86ae7b00b---xosedizinimufazudigov.pdf
    • https://krassimirtaskov.com/userfiles/files/xovatatiranogirudu.pdf
    • https://circolodelpistone.ch/userfiles/file/kesuxobuwazilisukirojewa.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f0007bb7---kugerawuzurubuxe.pdf
    • http://alpinedelhi.com/userfiles/files/31560320831.pdf
    • https://ebdaatcoop.com/userfiles/files/75318085344.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=burn+the+stage+episode+2+dailymotion
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 16792 bytes
font_01_sfnt_off0000ec5b.bin
a8f37ad7fbd6d1c402910a1ffcfcd16ab828788be724e3f0b52750d14431af60
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 20296 bytes
font_02_sfnt_off00011f91.bin
de2f509f81d0eb88fb8a775a816ef4221e5fdc4f6f33c0c36e69142a1c8f7728
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 11228 bytes
font_03_sfnt_off0001398b.bin
a33483531de591e73911c9df1cdb89fa7e09286218f98e37909ef8106cb692a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 1924 bytes