Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09bd6c0f0b5543f…

MALICIOUS

PDF

92.4 KB Created: 2021-08-05 17:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d1c398f49dc62cb9d92a44e1e7dc6a15 SHA-1: a52741b664172f85f5089cf452cc7303eb78eac6 SHA-256: b09bd6c0f0b5543fd695ae2197b7e17559900e4c992b6a2645572081ec7cf0ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://huntic.ru/uplcv?utm_term=how+to+change+schlage+keypad+lock PDF link annotation
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/800447535609b87f40ae3f.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b796e7030d39e5390a7e98f169bb7575/towuvatopurusozuze.pdfIn PDF document text
    • http://davcpundri.com/css/file/zoxamejir.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f460619f8---64943741510.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/rovibemugow.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/44107452360.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3f0d8322e8493ed973f28415fdce6d9f/satodadiwatixemimewi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/34h9v1dotntpkadt5u0e284048/89840664262.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/tetipe.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607122f4cf381---lesoxevosoninilunu.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/gaput.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/39438293978.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/raritarozevaturaru.pdfIn PDF document text
    • https://noddy.nu/images/file/megakuvumofojufuxuduzuzu.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/numajoponewinunuvijaleluk.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9kht7ghjhj537eg4b1aaqfaui0/sesepivux.pdfIn PDF document text
    • http://deltools.com/userfiles/file/jofiketerakobajatav.pdfIn PDF document text
    • http://ubest.ru/images/file/43090791066.pdfIn PDF document text
    • http://obermeyer-modemarkt.de/upload/file/46707194586.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d648c51917---zivakoketi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16089fcc8dd7ba---19617242918.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0lip9gd7i5sfktmijfm0k7kj66/natosipideror.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c9c4ec5e---5249609437.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a58a5f0c9---foretujizomovaxuzawitek.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d35e9d282---tubujalusubulin.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a8dbdb59---mapabaxozotigenote.pdfIn 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
    • 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_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10884 bytes
SHA-256: 0177f174deeefc26613f81e09f39730b5d76bb55975604ea29c58f9a6cb72c46
font_01_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 18812 bytes
SHA-256: e60e7accf42b86a8d9679a8e304db4212d44e3abb68cfe42e2083bad87cad466