Malicious PDF — malware analysis report

Static analysis result for SHA-256 101641c576f33ab9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-26 04:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0184755a5f1b7245f6157ae6ed20b642 SHA-1: 91bc05c342e80f6b997d79d664155bb62c9877c6 SHA-256: 101641c576f33ab96582500f346b9b91e4562bd6dfc73979de1cb6330bded834
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • 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.
  • 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://aqcorth.specialty-match.com/upload/files/werufujotuxe.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/mafugukovu.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/69812403824.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/rititilido.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/27804762810.pdfIn PDF document text
    • http://xsteelstock.com/d/files/nomiribujazivuwutagafasok.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70729035600.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5e86f220ee3ee0104fa48e7ee76cdda7/34017657240.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/bibixedewupadejofabido.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/86930706342.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/goxuturab.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090522075487.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/85578454361.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59ad95cd7---fezababunodolalodijomat.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ol9h6j654vsu4vvl3knoiol3kg/80798165160.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/76499813987.pdfIn PDF document text
    • http://trivio.it/userfiles/files/remomilobivasij.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/baf9efe1f8153eccf6ba38c50521d9eb/91577842524.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/jemikus.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/kogeb.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5464641ce8a441a02f2ac3fa1d942a72/diwugu.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10692949621.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092222131673499.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/dekifagobijolesom.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/93454222846.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/23895991221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+does+default+notification+meanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d0cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD0CB 17936 bytes
SHA-256: 4d4c5810c1411f4bbe41b3a0543cd2d5935c1c5b801e9021b6dc89b0d3f8d173
font_00_sfnt_off0000b8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16128 bytes
SHA-256: 73640179e7cb4fd23474aed93577dddc0a6cabdff572d039ab5bd9b51e474fdc
font_03_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 10732 bytes
SHA-256: 1f54747583976b4ed028f99b9a0328a4bc522701b969498e01733aca7aaa0710

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