Malicious PDF — malware analysis report

Static analysis result for SHA-256 551eb4c1c0b3c44a…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 21:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c7b0a8c3258faa1f03ca8173ecb9ede SHA-1: 697fbde1dc6dddf274f6826b04b30ec015ee8cee SHA-256: 551eb4c1c0b3c44aedc24ba0630d31b4db65a5625bf71ba228fb521a90a55fca
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to download and execute a malicious payload or redirect the user to a phishing page. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7139513c4b2faa10017d792b46a44e1e/85273038110.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/afd6706249d6f483321ff1ecde53a4ff/22865840867.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/gagupisanefi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210714_000349.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/35084798219.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/fopajaxigovudusedulif.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c31gbkkhvnkbj47ldiem4ukhae/14646609370.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/2a5f06bc825ae8547ccfcb44f2b66b66/ledokowosolomuforinegubel.pdfIn PDF document text
    • https://rotitelor.com/contents//files/33144310288.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jvbg1nrnun3dr9doqi1fvir8r1/34541824137.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/74624341412.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f31019e1---nebuzajubojuf.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c92aa85946f---61933367473.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3fjf8g28sm5aaltmbs07nmeld4/91637067035.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rr72mov88idm0u9i4lsfmfcksp/99633978708.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108180620204732.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2k5j53bqj8p4sq06lg3dngm3s2/tedujafosugesojimiv.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/37748595125.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491382fc19---55964253770.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f94e7d5d4402ecfa123702adfe19511e/lagela.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4878b502403a606a4133a89973a7dbd2/1284803658.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/pudilutudo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ldn1ej8203lm71vopkg5iqt045/21957661649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=goldman+fristoe+test+of+articulation+2+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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 18416 bytes
SHA-256: 1e37920f5e65bd450bf8e79391b115d162bded919d8fb821dc7681f8f7a4a06b
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 11040 bytes
SHA-256: e65d91f282f0b45bc56f40b768b2fa140e1d1ccdf6dcfc3543014ad2ffcbf221
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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