Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b5a6bd4d0c2ece…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 21:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08561fae8e05e98aaae284d27fe3fb73 SHA-1: 58aec94d17c5c4129cc0fcbc18f5abb0e6935da9 SHA-256: 11b5a6bd4d0c2ece6efa02f4f7330f2411c207a9c7bbe53fe2083b16b3a9eb21
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads and disposable hosting, indicating a likely attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370aa94e5c---leluto.pdf In PDF document text
    • https://anmoul.com/userfiles/file/491060920.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/90722272925.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/87368953512.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd57e000bdc5e2f751ce36416a0b0c7a/64217306760.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ca2adfd0---bimoranazepovububufun.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9e44dcbc2dd588be4ae1fd749add6282/givilisajagobonaz.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/94jb2tc18ot45ohmsllgshqn20/41632470973.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2609b5a5.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/8566655235.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10e12371---wupadurezijet.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/43078784444.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210829125106_b8rfa9.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c8b588aa---43088462302.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/86762762383.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160883b6533c0a---wutep.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/61232345835.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086f7024a1cb---69991755996.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/fipojunakazuxudufixuxax.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1grkj4jqo59hs3vdaa9kupp5h3/kolisanafewetovizilujevix.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/123845c3c6a8f74e8794f64a77bddff5/84793445905.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd07214f44---ronajidazatovulezi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c531c016e47---18198001006.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/70869426342.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wusunidasufifaseb.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/5161475244.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/44509494399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=panis+angelicus+lead+sheet+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_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 17144 bytes
SHA-256: 11ec626ebf7e98db40ca68ebc9dcc2f520509fee956a98684bf42f5f43662fc4
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10780 bytes
SHA-256: 54cc8d544176c0564416be2e81c0a1f7cd1ef557c7793e88e368e7ec10337b0c
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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