Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16bba0684d98e6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-07 15:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48eebf6a038e640aaac7388f32c4fa7a SHA-1: 800a195180d87dad1545dfa1522ecdc896bbc1d1 SHA-256: 1a16bba0684d98e61812b7c680959a2622ef788983409792c959583c864a86c3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The PDF is structured as an image-only lure with action triggers, typical for driving users to click malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=brzezinski+strategic+vision+pdf PDF link annotation
    • http://88cpap.com/userfiles/files/21034105789.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/58007526735.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/20963326759.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210904_025926.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071670a535a9---91503669786.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3fab71cf---8788114643.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/17943395499.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/4577888640.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/mobubewevufofidudodenep.pdfIn PDF document text
    • https://ijpdua.com/contents//files/60308161440.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/zezirilizidavug.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ziworukotofakudavut.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c5629255---87958436792.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/rofaro.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d208779421---jetifiriwevaxobetesiwis.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28752589758.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gonazifififulapob.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/mejugowojubopuwerivukudi.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/52361275936.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7329b316cc4c5945acc8c0aa014fc65a/93469939720.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/20394990108.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/911bi6l9dod40a6puspjo7dg93/figekigifitet.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607117402c7c9---99227000415.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_off0000b332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 11020 bytes
SHA-256: ee3f3541ee4c98b875f0f8edd0819eb2d6bfe2d627d668564674fdfb0d9f00db
font_01_sfnt_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 14380 bytes
SHA-256: 224d43d2c96c7440c2c229da038c835cf357313d6dd4b8c3b74caabef8d5e4b0

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