Malicious PDF — malware analysis report

Static analysis result for SHA-256 5633c3863864fbcc…

MALICIOUS

PDF

86.3 KB Created: 2021-06-24 07:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 440eb288c09f532ff7f9a5ade9e1467d SHA-1: 1b2a7aefa655467c1c1e71605f3024570dbb140b SHA-256: 5633c3863864fbcc7b13dbab6054fe1c1b9bf6ba0b5b07537c938b0ad99b426e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The document body, though partially garbled, contains text related to 'Bajar pdf scribd' and references the wkhtmltopdf application, suggesting a lure to download a PDF disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=bajar+pdf+scribd PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i23d6k5ns5ck81l2lck4cuh657/gufukaxefaremam.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/84449429195.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b148774dae0---19432060720.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507170217140997.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210612015457.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce71730fd8---miliresifuji.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b751355f---farutanorokofiwijuxeduxu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/ketapusibos.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/755e5009953886761acb29d5c9a6c343/buvivuxabakaxikexidod.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/43623938735.pdfIn PDF document text
    • https://aashianarealty.com/file/vejadogepinotin.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/reraluno.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/cjrfm2furnaicjml8l1k2n16d9/75470308713.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a868f9230bb---40113457860.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/49fb654de6d4f15932644be2727d8be2/depazufe.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/litimufotuzeta.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/60faab80702269c5b3aafc6ec22761cb/potamifabilozozaligizer.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/waneruzamevo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070204be4436---nibewoxomonalawuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 4756 bytes
SHA-256: 526a10982c198886ef10523e696084d2413264b7b29a31fe99c8edb506bb642e
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 12388 bytes
SHA-256: c19b664deb3026504b8c9ad0b9a62a99f2db425ce498eade961f6809bbc6ecb0
font_03_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_04_sfnt_off00013d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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