Malicious PDF — malware analysis report

Static analysis result for SHA-256 41183216ec800903…

MALICIOUS

PDF

87.0 KB Created: 2021-07-05 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cae1801374dad0ee82db239f16a8cd6 SHA-1: e3cf4a9a29486c5a2a6507780649cc164d465231 SHA-256: 41183216ec800903240c065c8838c7d2a7a3e132c4ee59bdd3abb02fdafc09ce
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic further supports this by identifying a callback phishing phone lure pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://misosmile.com/upload/editor/files/bobupa.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd961d650e---fulavefomar.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/wefelojixofiwuziz.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841c2d9fb0---powuxogidebawukuwiwagan.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a475f58---simarunajenorabefonofup.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbe0d2e12---pijepuwo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb555c7b3b6---91625884178.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1286eb6dc---falizefusulawareroruso.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f659fe0fb5---35526160069.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160953cb311beb---91387973177.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7qn0a24ir1c05ka9tljo0d2slb/55811473808.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/4837809929.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/s4a1nqqna1uq3tb1flo3703n35/xubuwuzawutupiwaza.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be62b08e5bf---27212886653.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/86601047166.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/14379986746.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615203203584.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gejfmc9pf6knap943um6ujjmaf/wovomep.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/tijofasexewupopewezenine.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rovomopikese.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4e1bd1c1---jedezesizega.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d60f0dc7---10212527285.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/pamilojapazawijekiso.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814df3744b7---mesujagedopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=transition+elements+melting+pointPDF 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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 17464 bytes
SHA-256: 33984c6e59ae8c12c7ce0245cdbb6ddfca7114ad040259f1c99536cc09518ed9
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10556 bytes
SHA-256: 40eb104caab263ece85bff1aa4cceb6e7a17e5d4598741d4b308507eb70c7209
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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