Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f2f55709167289…

MALICIOUS

PDF

95.6 KB Created: 2021-09-02 01:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69415f5aec2a38b6bfe96fd5e5ccd6df SHA-1: 1e19641b29b705f11fbadffdd9a7e13fe5fabac2 SHA-256: 57f2f557091672899b71103a85fd19fd233b0194b96b499f30e539a5e7685e7f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=name+for+baby+girl+start+with+r PDF link annotation
    • https://bdsvieclam.com/upload/files/veguvapowopexuzu.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/wekuletuvemujuxa.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76503a7b8---47167093526.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021082405302680554.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/13913ebb02fa029f5c1d7e172a855ca2/kitavovapemizosukefi.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b6a31278cad78a751ca3d21c4466463b/lalumekufumoj.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd5269ed4f4f1ee05206463065fc4e14/vivefefeku.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/699d528995a7e89872ef0d29cad03810/46707709431.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/pimonigibugavaxuretor.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pbsumcvdr97d0vt3aukk8hd5rh/18999704358.pdfIn PDF document text
    • http://anm-av.de/uploads/files/xudizapukixigejesenujo.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/fovojakekotuvire.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/nurasabiruserod.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///9855403194.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/sitobewopipafige.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b68b997b6---3687207913.pdfIn PDF document text
    • http://www.toptehnik.si/images/33061076924.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0944b3bb5485e809a7f3fd080fb69896/womijegolefozu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/644752574db4ed2b3496956b88a93720/55075052779.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6707cdebc---pisujonutipedosirusupego.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f97390437---88580949610.pdfIn PDF document text
    • http://isvpro.com/custom/files/toxepufebupuvum.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210623080416.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/bapimawubawuruvexip.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/47a354e5a93c33196237ef58e834685c/14604215420.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_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 18672 bytes
SHA-256: 32c6c0f81178fcc9f1cafb0eca46f179e2325205c5b34a61bf887632b1ce9928
font_01_sfnt_off00013f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 10876 bytes
SHA-256: 36023b88c62bb8cd08cbeb20d6f9cc4b62de620a34f867af4a8b9c0a193b90a7
font_02_sfnt_off000158ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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