Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7aae9597a4d4d2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 06:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c37befb04d5c85bf9dfa9af1f0e0c951 SHA-1: 7e96c558f2bede28933e6a0340dc34b5c0712a26 SHA-256: cb7aae9597a4d4d2d1b12f4bea3decf5c6c9c26154ba11dcf36a0fda74083fa8
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable hosting sites, and includes a "download button" lure. The presence of numerous external URIs, many pointing to unknown or potentially malicious domains, supports the conclusion that this document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allamericannursing.com/userfiles/file/90615381417.pdf In PDF document text
    • https://jackinthegym.com/uploads/files/202108180846027652.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/41702053852.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/90445870098.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wukilogigofiwosubajemerab.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/mutilijefule.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/jakezarufabopu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fezunegimebul.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/xorowedad.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/vuzemafemalitefo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gubejonez.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160773967e6ba5---didedewisofazonokomagezi.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-13/20210813003046584842.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b656863e1c7---naxuvizer.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/nixebunid.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/83343494475.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/78262837823.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/lulefumab.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/73541561572.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3e0ceeea---58458020008.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3037b70834b1229923f832b8304d9ba8/zoliga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=2012+range+rover+evoque+owner%27s+manual+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_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 11280 bytes
SHA-256: f28b18e87a1a6268a445d699d99d2c8b89eef81a960c80387dfbe38886b63577
font_02_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 17748 bytes
SHA-256: 3a6259bcc96e5074c146586936115398e4478fe13696cf150120c1ac60c09bfa

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