Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f0ca1b76c02cde…

MALICIOUS

PDF

113.9 KB Created: 2021-08-12 04:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7d854e3f67913e4fc2209c98f4bc917c SHA-1: 4e17e753ecf7aea0f1fa7561ebef927aa23a4d4b SHA-256: 78f0ca1b76c02cde49cfca185f449aba5548cb039d5b6b73d208acb2fd774540
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on various websites, many of which appear to be compromised CMS uploads. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/zemalokowibijisemepat.pdf In PDF document text
    • http://0851gay.org/userfiles/202107file/2021071019175670554.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/73540726691.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/68916440722.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/743aa20062d9a3fb0cb4c2e59772cb5f/85030938743.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6ddaecd5c---jofugokozi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e10eb63ce---pageridega.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/7502868053.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/13807005790.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/galimozufajejuviguk.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/fizewub.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/55352278146.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/detomagatemiwet.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/60322708664.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4439406aae---71938529163.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d876d95cc0---9048428358.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b12198534a2445e84e58fe4ce2a52827/widojix.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf032a535c3---xovew.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/52978342086.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/62546968695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=autocad+2006+keygen+by+again+downloadPDF 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
font_00_sfnt_off00014a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A09 11200 bytes
SHA-256: 0a4bf168d69ff2f623bd8cb444e64f050d611c409a49a602ef210006f5f634f8
font_01_sfnt_off00016451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16451 19796 bytes
SHA-256: 38e274f54358938e524d92084cd9802c4eec00520a23e67e8628a9adb7780b3f
font_02_sfnt_off00019786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19786 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_03_sfnt_off0001a185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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