Malicious PDF — malware analysis report

Static analysis result for SHA-256 827e560a778317ad…

MALICIOUS

PDF

87.7 KB Created: 2021-07-25 14:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60f549a1a6d06c943996d3e6a0a4eb95 SHA-1: 4f2834799ade1adb2a8cfb8bc5ca34f7c88ab237 SHA-256: 827e560a778317adeb5964ccd7c7b54ae4880dccb0877f620efee61d3ef9d0ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zuwebegugole.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/16685330900.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/33481576340.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/67882802774.pdfIn PDF document text
    • https://iword.de/userfiles/file/38782440650.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8012304f---94781784163.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tugegaxabelu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/75061204215.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/49835459469.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/bimazekibijuwoda.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3338ce21a---26864128777.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/64001a5c031580041ae62390378994f7/28985386975.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/63608798157.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/zadesitozis.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe41a8d013---dawopidorovufutu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/raderamirotukumar.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/dezotukevogimesujawovafor.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b039df610---wegekumoxab.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/pukunutizaxafosusawovepar.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/41169601109.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4a28654a---xugakapaduvolininerate.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/f15f70vuipe93anq0jef7u7d6p/darixevatu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3998nl4tpd7fbnomvtsajofdge/72240881982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=driving+theory+test+practice+2019+hazard+perceptionPDF 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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 16568 bytes
SHA-256: 86c90cf6f9cb3e7d31dd560dfca3f81617fcbee9ecdb010cfb8a2009ea902015
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 11448 bytes
SHA-256: d767be8144cdb98e2d7b442ed6697f0218f5a95a476393a0a41c0ae0b0734978