Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fa86132d961c51…

MALICIOUS

PDF

93.8 KB Created: 2021-07-03 04:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: abd5e5fabb4c93bce66554b684d23d7e SHA-1: 0cf0d027735a891ca84af957a08ad586e39740e0 SHA-256: 16fa86132d961c51076bc54024123ef5c05567f4a99683aae73ca1aa0db3ea3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=definition+of+the+word+hyperbole PDF link annotation
    • http://jpind.pl/userfiles/file/71279951424.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0munqgj7kbqnvit4ijbueieej7/77665104436.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/em6sr869p9tau8nr55hr25dsei/83495893592.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/wijiben.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/49605682348.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/49120964820.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d760d8ac494---gopirijikegudir.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/godutojanabi.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2106232337533301261149wn5wws8h.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bd1bca845fff5a4280a4937b41d58b21/72061936646.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/dabeweneza.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d6954920---37155296470.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab2a35744c---gexugowowebidij.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/323da60a75fec16b5878144d1b90917d/66216726427.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18b88c7fc---28391892611.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/eaf08bcd05c62f50f84eaff608426120/91680450138.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b51aeefa6---bedebofojizoxejekiduzid.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/79930909945.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/wavigojufokideponotoxax.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091f623801be---fogoninirubosiwewapef.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/jubitabefusepizekuxaja.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 10604 bytes
SHA-256: 552800c2cc9dfdb4a1d01f372439975a282785b02dee2821d556bdc4b5281fd8
font_01_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 17464 bytes
SHA-256: 500149d9a502f183ccc269cc637c8537bfcc23ab6cf9c6eba92291a305f097d0
font_02_sfnt_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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