Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a710e833d7eba6c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 19:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c51e117029614c539e3381ac7bf363c SHA-1: da32e1cb2758f5edde95b936f35a9489b9ddb8ab SHA-256: 1a710e833d7eba6c2b33f83cf74a56d587198345574b324d4ec069c9d47d06ec
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. It employs a link farm strategy, directing users to various domains, some of which appear to be compromised WordPress uploads. The presence of a 'download button' lure and explicit instructions for a password-protected archive further suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=redmi+note+3+stock+rom PDF link annotation
    • http://www.moyekolodin.com/files/vafenotipafif.pdfIn PDF document text
    • http://sbairs.com/datas/files/48397212892.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370867b39cd---58172775084.pdfIn PDF document text
    • http://workontext.ru/media/file/8756970080.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/16610816684.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/ribosegi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/2723579151.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/56126494756.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/lorilimudikutafovaxoxani.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/94435132276.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/63165262382.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rikasodazisedotil.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sixugikode.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/tojol.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20748499063.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/86510220455.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/sibotu.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109060853174662.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/19001040778.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3239e5c4---54006374527.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/50250858116.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ae53khrle2v855v32rtfjeej4/mujofenafonu.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/83160414603.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/kopusovaj.pdfIn PDF document text
    • 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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 17364 bytes
SHA-256: 61ea30c98ccfd9ff09bc52b50962e4092801dea9c41252cc419e2b777f698427
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 10632 bytes
SHA-256: 26dcb44fc4ea31469a7cb8017fa5887c2abd330f02f916192a1b73aba319f4ce

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