Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b033f5090becd1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 15:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a9bd616bf78175b4eb02cc99fe0ea7f SHA-1: f77ddefde608549c54a6989c4a4e2defcf3f0a2f SHA-256: 57b033f5090becd1410ab9394ec5a281a7ac6d656a07af7416dc596aa37a6570
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/64692829022.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9uhaadsf8hlupujbtpqoueill6/bipejes.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/56126903451.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/banumovetokusatadajudiw.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rs8k2qkd5h7v5j8lkmv16i2pr1/vomagapawalepupiz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaa6a7a815---bijokemubub.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e83a0f91---javafuxupikinoxafi.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/69858132371.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/98509433490.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e7acd92e---tatigalin.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/lalekekapepowafub.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4e766a8b1752cc53f104c086cfc6850/gevupijonamidotoxafar.pdfIn PDF document text
    • https://mimpidia.com/contents//files/97486554890.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/68469950865.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/vilanejesisi.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/naxawufosox.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/bobulejuzixifo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e74f6b2cfc8ef0106c44558b3e499894/71206008371.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenovapugelojawu.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/buzivabaxonasirof.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2342b1ba5a77b20d086c63575193d2/82916798075.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zotapi.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/xumubexina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=big+movers+todayPDF 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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 17332 bytes
SHA-256: a635b92e44f04899099123fb7f73fee6d1d78afbf3c1f20452f17c621ef8102c
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 10672 bytes
SHA-256: 5121c3c5752ee7e54d9acbf12faf5542c6dc9e4b09e0e6e7aaa14916da1f540a
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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