Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f93a1919e28020e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 10:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 149cdd5cff7b6ea995c9f5a47401add0 SHA-1: 8f9aa5ba47a03a38541449ce46217f1de57b7ae2 SHA-256: 1f93a1919e28020ed6a8b045bb7dd9c3f720c340ecdd41e5ff03d1a96d0c06b7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://teusz.pl/UserFiles/file/jogimuzaxuwokanarosujuta.pdf In PDF document text
    • http://arcadia-fitness.es/userfiles/file/tazapirobujer.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/vofofipe.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/79847484294.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3170d427---mojedelamogewowigegove.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/13013461552.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vipojuzakejibaden.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/pomunijofakid.pdfIn PDF document text
    • https://fond.ru/userfiles/file/83442980604.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/repat.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/mitevusebofelarerasoj.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/15623742149.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/rajaxabesujopegisufi.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/datilolijuwubuzuluw.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88ba7820b---sewaneraxarelenim.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/rimajepise.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dobabomevotagavufolebu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ecd5f35fb---5923514532.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/jigamokojikovajixofomelu.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/77117957942.pdfIn PDF document text
    • https://tarsiman.ee/files/file/72727863081.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9ad9f52c21420845a116bebc183a52e1/6607622553.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bebf604ac---raxagufubimaxolepax.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/79075586439.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/sexumodafuzamegug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=low+mb+games+apk+downloadPDF 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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 10720 bytes
SHA-256: e2af5c02e5345bfdda8e8da8fe48f61e59058a44a9d413b0a4a8354d4f1590de
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 17656 bytes
SHA-256: 7d50e9354d90d679e40924880c84d7f442b3ac8db585867ce7cfae5d036f95e2