Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d4dc675c934c8d…

MALICIOUS

PDF

89.8 KB Created: 2021-07-25 07:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 876882a65f3f7cf7a6bff11d43e26a44 SHA-1: d5bd89e145f9de57d21b2fdeaeebb0241cd939c4 SHA-256: 60d4dc675c934c8dd31b32199c93a5de79d3213a6d4bc3eea6df97e6342a4137
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://print-resource.co.uk/ckfinder/userfiles/files/7657649761.pdf In PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160793afab5986---xemexekedajokadop.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d40b44bb67---55251177850.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857eb83367c---20972042408.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/pavujano.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/4239006403.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/677d669444dda843cc0e24efbf966243/39622786750.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/xubavetixisoz.pdfIn PDF document text
    • http://minhanh.com/files/41235753253.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95766215157.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a53b574e---kimezujasuwije.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/56857173916.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/h0rkkhisptgaeeu466pcer3gg4/98723382362.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a31075fed7d95d13974849433cf3ee03/najolirapemusitizini.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/39474187835.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/jidajemodivetokum.pdfIn PDF document text
    • https://synersys.fr/contenu/file/pipojoki.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9a74aea0---julubizeninigapeduvemagi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36cc540a---vedolutiwiduzepinin.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/gupojijitefixanevovobura.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0dc0dv2usdg8roeenilvkvmur5/62151856986.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/kk57idli9hevo7ieuah027dtke/99524732748.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/766e71c91225a5d5a6338032acf156d4/66038705187.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/brk6el0onrojbgoi067rcnpqa4/gofawaruwenokod.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/savisexabebuloduguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=1+hectare+%C3%A9+quantos+metros+quadradosPDF 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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 20016 bytes
SHA-256: b79a6e5e604c654a854e2663ebf9a92b45fc878e7ed693d07fa7fb34ef047a04
font_01_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 10852 bytes
SHA-256: 71c1408e0350fd01b5e2827926fda584c173dac4eacb76352e89babcc5855315

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