Malicious PDF — malware analysis report

Static analysis result for SHA-256 243cdaae4455b7da…

MALICIOUS

PDF

69.4 KB Created: 2021-09-01 17:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f5853573815edaef5ee219c43fd03e8 SHA-1: a56fb2c0df24920bbe3b0492003ef0d61b82eff8 SHA-256: 243cdaae4455b7da23847b539f3bc59ad019bea1b7bac62d620d0c534cebb2d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document employs an image-only lure, a common tactic to disguise clickable links that redirect to compromised websites, such as those hosted on WordPress uploads. The presence of numerous external URIs, many pointing to potentially compromised CMS upload directories, strongly suggests a phishing campaign aimed at credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://apc-algercentre.dz/ckfinder/userfiles/files/80797040937.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/62cb07782ae54653b563cab8523a0cdb/35109611821.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/51423c69cd46de3b4a140b274c845608/38929376588.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/428fb4146691caf152935eabeaa73a6f/96153390929.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/7718208790.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc14ae9e45---90169396434.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/maneboratamexazasiwomi.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jonugidezikazujibakulu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e4f7ca8d---ribodopatuvibemimomutel.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d2254a1e534b7d961c805d1ee48cd44d/bubeku.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202155203382897.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mgnva2nbnai24a1fdhojrokov8/fafutezebe.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/8eb3ec4951e41ca566d22e18a1dc04d3/58524713883.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/46439874813.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/55300278681.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/62550975613.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8j7t1i4sg8s82m6i8ouos31ep7/12416169140.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78678471953.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8860be297---28425328567.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2e364d7eec345fab57fb587bc77c8254/96956001905.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/82351347371.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/bolowe.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/51066687637.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/54137006366.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/bg26dhu9ghb3bsb1je8r92r8v7/zulij.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0148683f28---71909727046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+does+a+mistrial+workPDF 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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 13312 bytes
SHA-256: e52c915732c39e94407652e9b630950124f73cf995d2c91cb66eb700ba702ac3
font_01_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 10472 bytes
SHA-256: 2c0f084c2770f232f3d5db923478ca7f2182bfbd3c9ee1debcd6924b0ece40bf
font_02_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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