Malicious PDF — malware analysis report

Static analysis result for SHA-256 416e7b4636194e6c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 11:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a487d95c0248f41868f8dadab3affbe9 SHA-1: 367cdede9233547f96950e09fc0e19af9f13ae83 SHA-256: 416e7b4636194e6cf05f354f85dedeb1dab89d6fd3d3d5e086f8530c21a0858a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to use the document for link farming, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=how+can+i+print+text+messages+from+my+android+phone PDF link annotation
    • http://exms.fr/sites/default/files/file/josikujires.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/60039662841.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/lavevuwiseb.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/gezepulefosivuvek.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/42389400789.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/72824839866.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0604c8467---xofixuruluwutuv.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/nekamotemizujuguku.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/51701808958.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/65231112926.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/retepuvumakatamiwutaje.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/lalidufitoxiduzodudag.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/nilupanenoz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/29144379309.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/14363233770.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/210911061512922511ej2xvrwcicj0.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/44181764262.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/83003017780.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/botikizefawapet.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ktbgshclaudl94v72tqi1q3i6t/palododa.pdfIn PDF document text
    • http://turnyras.lt/Files/file/sakumixidozefo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ef8dca8---lafewovuxogoxugusinul.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/51014307699.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/zuxebuz.pdfIn PDF document text
    • http://jarosi.hu/files/file/57017859290.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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 11312 bytes
SHA-256: 5f15e81c74575b69d3bfb6e017dd34959d26ce41ae066862423cd1a51b3237c1
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 17600 bytes
SHA-256: ec0855504a9bdac7b77caa0105ca96243c5a721fb586fdee68ccdf7c1122a7e3

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