Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5176a1d64eb210…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 08:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d8ef8312c61509e49c5848e41dad122 SHA-1: 3828eae4e7ea253cb30af787bde728e9dbc7f9da SHA-256: 7c5176a1d64eb210b5088de98328be1cbf3c3e59003829bac3c6cb9be6e76c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links suggests a potential for JavaScript execution or exploitation within the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pollackmihalyiskola.hu/ckfinder/userfiles/files/pitisa.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cohi3qnukdjghrrcr5r8ogsrm0/redakeb.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ebc4b6ac---libibusalovewusu.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/mawoxowabenina.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/24888714785.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/poraxunefikitisabu.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/serebizoregovijodoroba.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/32853037856.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/92285824515.pdfIn PDF document text
    • https://cartolmania.it/file/sexebopofelakiwokup.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/23408635052.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8c5fcd0a11daf97237d1985def8e0a6f/80078177799.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/fipivozujazilit.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/68536390423.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/videdogamuf.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/4805722430.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/26729944600.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e6a5e419---xujosit.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/nenulujafibudegolebaji.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/41404928068.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/45226434598.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60701d27f9---jopij.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/mukokigotuveguvivajadu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/foxuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=url+was+rejected+chromePDF 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_off0000c16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 20460 bytes
SHA-256: be40cef99bfc801bb0dcfdbb25e67aa198991d87348555dc568948fe447508ec
font_02_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10664 bytes
SHA-256: d613a60a376ef2b2fbb034958aa185eae8f70a67892041e406eaa4277c8af47c

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