Malicious PDF — malware analysis report

Static analysis result for SHA-256 181326b7cdf40d57…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 23:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62846e1c363a938208d23251138cf356 SHA-1: 0aac41aae6a9da93b23abd66ede82a14d70810cb SHA-256: 181326b7cdf40d57fcf462a029db91c2778ae4c2fbbb42ec0f7283fd608a9bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm or phishing campaign designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7134e6e7---15360145050.pdf In PDF document text
    • http://easy-vent.nu/userfiles/file/45494396945.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/76710997038.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4b7fbbafd7622fb67f4fd68666a8deaf/37694327640.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5q04pgnct213ihs04u3371d0m2/bapuvuzalakunaromol.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/46ikgi40u21g4eqbk7vnp4n9ac/29643795647.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/877301453.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ec4ef1c8---14383549208.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gigam.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17293a4ba---jexoxo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d935a0136---zezato.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/fujefupuna.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089d8350ba8c---konufewotirerevisiwef.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2eb1cb53---90641940490.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/zizobajemawuj.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1465897c4a349a2d638618ea981393f6/58993438669.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/80957655619.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/kutunikirato.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa7bd26ed6---90273100043.pdfIn PDF document text
    • http://honghuibio.com/d/files/73723738099.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/7586230168.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/22497133550.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/zumowil.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/wumuwetonivebopaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2003+nissan+pathfinder+repair+manualPDF 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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 17260 bytes
SHA-256: 1951b8821cebb21a45cb5a74ead02eb9d70a4b2f25ccbe90b97abb3612d08b83
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 11060 bytes
SHA-256: cba0848347ff6debe369e4216dacbbf7a009450b191986537b0b0ea728976f6c