Malicious PDF — malware analysis report

Static analysis result for SHA-256 722d4b8886b58cb1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 01:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c6b211ef71fb6aa43364eb225b4175a SHA-1: 12dbf066843d2814dc8ce2c03ac47b2f663ed17f SHA-256: 722d4b8886b58cb1122c9eabdc65c7ba8962e9f975586794b0d04cb344bfccec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=4468+mosfet+equivalent PDF link annotation
    • https://nevisnews.com/userfiles/26935184651.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/gefesasodoxigebake.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/majedekaniposu.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/66103057470.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948753445c1---fobobutiratologidifu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a4233278---vinanafevufomojudaf.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/damosolefusuwov.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rgp5c9i9ck0g5b5h89ikfmbhvj/pagopexapenepe.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae3290c9d---tupufusuvenerij.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/31537414095.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ec015ec1069ec6143d82a1320408290/36541570823.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0095a225b---nafegibokiduzujuras.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/29933073785.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/56341410052.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/40868111663.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5b88efa2---49718569090.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/82890418509.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1tjc036cfj2jh4tpcjcddacaqe/53694459252.pdfIn PDF document text
    • https://kueapem.com/contents//files/95943751102.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/31ntp9nvf96e05qjuii08b300u/15820022597.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/74436275057.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/popezaf.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8309822a1b---dujogodutudawudul.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/59069d576ca99d4a1d535d51a461798c/51638044352.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_off0000c306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 16820 bytes
SHA-256: 10d97988325bff1b5f2ab1693d257c9f9a5dce01741988884074f8c5df812661
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 10944 bytes
SHA-256: 6ecfb6892c763a64794dcf59a657b6d33bf6c7c8c63cb95dd4c81563f1793139

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