Malicious PDF — malware analysis report

Static analysis result for SHA-256 702a563197b5bb88…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 11b197ef9b633a92055978c788592917 SHA-1: 519499932d2a208751eb42d8172ad43a0dfd1c28 SHA-256: 702a563197b5bb88febcfb118196ba7236b516e8df40f50d6c2920e53ca06b62
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious links. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9deabf1b6d---31470737807.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087990f0f5b3---wuwadujelaguxutosarojewul.pdfIn PDF document text
    • https://jurad.eu/files/file/nafovilemumolavewu.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bfe113133c32f93370944b324a9436f6/82275152039.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f3b44fbb---magibipig.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210624025321.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fae3e5c9ac2cb32c670f2ad6864cf08f/dibizitaxukajajenupa.pdfIn PDF document text
    • http://msiutilities.biz/documents/tesimuwa.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/71910710585.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jomuveditixiwo.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/58533778262.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845862d91c---dubutuxanebatigavole.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/futadusiton.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/24459700057.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b29de7210ee525cd8a0adccc547ec322/gegesuwusitoxapif.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/39835324861.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/gosomufodeka.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/14282232209.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/67308629123.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rcdcb6k3gadlrdfmj1b62e4ri3/wesumagevoratike.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f7dfd05a688806a5585758dabbd29620/jusinagepovunivusepidi.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/44800775880.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed590d9035---dediwiketowunuwesokobegi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d484459a05e---lotefazasixevivepifez.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebah5g2ss9ustgigiqguec2mq0/zuzubowekufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+home+edit+book+free+pdfPDF 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_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10476 bytes
SHA-256: f85ec38a715e13fd3463bba8b1d2de82e8188c567a5d26f0f53d1704f7557188
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 17236 bytes
SHA-256: eed96ef466509d044a33323ab196326a7d98fe209e7a7ec0cccd40c93a42ce29