Malicious PDF — malware analysis report

Static analysis result for SHA-256 317d5afb599a1461…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 04:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e21ac1c5fc0ce1edfb3b8ec281d29099 SHA-1: 421687b421cf30b1d5c5cdfdc8dab2e3ccd4ce81 SHA-256: 317d5afb599a14616a7e808cf989c0860f857c51f59da270cc0898fd0f16d5cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The primary goal is likely to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://myrbacken.se/login/ckfinder/userfiles/files/subisaliw.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4f915060---93239355062.pdfIn PDF document text
    • https://hsse.cl/files/41640823944.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca9bcc419---3914140287.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/48306753356.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/sewalububajexesatiwaputos.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/79724567702.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/30896998277.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/11661602254.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143f1963cdaa---7872726386.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/69535993806.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/gisevur.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gutigagobexogivujebudixix.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/153159928.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/fesaxasutetasukoma.pdfIn PDF document text
    • https://forumsevens.com/images/file/tebitaxo.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xofewezule.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/relegigenubemaxorapavo.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/50002639199.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/buzalam.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/12951510860.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vavanizuzipudigoferugopen.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/58374004717.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/43557170927.pdfIn PDF document text
    • http://superazs.ru/images/news/file/4363507258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+install+minecraft+java+edition+on+androidPDF 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_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 10908 bytes
SHA-256: 20584ddf075d488a23a744c40262cf3badde75b2dd118d1824760678170fd471
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 18156 bytes
SHA-256: 36cea9bcabb648ad5980eed5ea4225dcb5ed12f5de3802b7e96f8a45c675138c