Malicious PDF — malware analysis report

Static analysis result for SHA-256 180698509a98cecc…

MALICIOUS

PDF

89.0 KB Created: 2021-07-22 21:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ccc7b75e1ca8411ceec3d6621a29342 SHA-1: a8154df26eb02b61e3f8c630818311c0fa417ffb SHA-256: 180698509a98cecc7e9c8b2d491e4415c48eae0a9f5846fcd2dc93fe250b6281
204 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, several of which are hosted on compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent to trick the user into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://toskov-yordanov.com/userfiles/file/62235715165.pdf In PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8fcgc5evds4fpkpg3lfnmaag6n/pamidurobeput.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/59805615270.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zadeluromesifitesabopuv.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/gonaloxeseromon.pdfIn PDF document text
    • http://rajatotogroup4.com/contents//files/jumatakojuke.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//dawaxifujere.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/76def146217a71657334fc02727c25e7/zizexapuzenu.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/vepuvipuxomilofefevor.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/tigukofekufitigetaxav.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/gomumoxatuwadufu.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/41088597947.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/63424648344.pdfIn PDF document text
    • http://flomojapan.com/upload/files/28193246983.pdfIn PDF document text
    • https://ancoraeducacion.com/images/9614802378.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/kugemobuk.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c1bf7bd69---pesupemepaxurovaxotinija.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/e0e751a8b069a30c548085f1436f16d5/31344025035.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///70138618033.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cfae9f6fae08641a49e1b555b1d2f8f/makopotifab.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863b3ac0784---76841923459.pdfIn PDF document text
    • https://farstaslottsvik.nu/anvandarbilder/153/files/54350216703.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gafikovaferumabofu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5676d96c5---60428246285.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tunubilumotepine.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d31d685b87a2d218f08976e4308ef339/piwofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+install+questie+classic+wowPDF link annotation
    • 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_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 17268 bytes
SHA-256: a3bce01d9e84d29e03cf0c3a1ea8e0e6ba73c16d27230b4dad6fef4359b58f9d
font_01_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 10444 bytes
SHA-256: 4fbe5ad1ae5c867009107807731772cf774dd69d8cf6f6a7577c03a28f1fd1ce

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