Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7b6e66b402dd37…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 22:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84014713b7668aa196d016c7bfd457a6 SHA-1: 27c1499ffabbfd16a7ba226e7ace1e5f5f9f5204 SHA-256: fb7b6e66b402dd371275f57f2b24ac245af07f290d77142d28f5db1f036f1858
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of numerous links to potentially compromised domains and disposable hosting suggests a link farm used for distributing malicious content or phishing pages. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number for fraudulent purposes. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://feng-shuiworld.com/userfiles/file/13712259267.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1a5990c10dc3199e52dcb40322936dcd/99946514799.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7b04hdb0c53h5v5qgu41hr5j0b/60993244002.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fafokizo.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12422773577.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/kogomuleponofexapudaxifix.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/butumugesuni.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7bbf6c68da16de3b339a3d060fb56aa4/74744365123.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b1895e52---37698367722.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/be689dc3bf19ec950bd456b6a8041ba2/munakowisexafalokelevu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mogaf.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d854b425---vaxarorapawupi.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rmqf6j6l63sqma8uvdtuiqb2eb/91559367243.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160923a6aa7c6e---sivuvevanazoto.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/tagigerizifa.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/25186880569.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fukjufu94e144fbhnd128jjpm6/81203548380.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c6ef61619cecf319b108844b59811219/23093006064.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2e4961db---46752995333.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/55121039975.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/jadajinarokujaputizuro.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0bb89815741149d293df07611a071e26/37198462011.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/10915510320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+remove+password+on+pdf+filesPDF 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_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10804 bytes
SHA-256: 979ddbc0d9ebf0e87760a4ddc8613461b12a49ac4b6d76d391f8632306850ed5
font_02_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 16716 bytes
SHA-256: 06b37c2cabcc0760e831756cdaee6ada0267d74a2e0c521cb30342ee265b6a35

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