Malicious PDF — malware analysis report

Static analysis result for SHA-256 938eccd7b9e0c292…

MALICIOUS

PDF

101.1 KB Created: 2021-08-19 03:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2c765bff1ca356485eb3d125aee869a6 SHA-1: 18e80846f854136758b968f99ece48bb9b399cdd SHA-256: 938eccd7b9e0c2925647ae92d9be90c23b6e7056e620af9141198fe31df79331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://laborke.ru/uplcv?utm_term=benson+h.+physique+ii+%C3%A9lectricit%C3%A9+et+magn%C3%A9tisme+pdf PDF link annotation
    • http://fobosgrunt.ru/files/ckfinder/files/wogiteludazejazepiv.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/julemutopixijejomukula.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/aa7f73f097e96b65f27f3db3fdb16b64/68028981319.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93b3a048a---92178148506.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tabobog.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gefuwexopek.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/37601575043.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xobekapakazuwigon.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/xegemab.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/fajidinevidopogiwoxuvoj.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/62410500740.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907c29a575f---60382291667.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/27364151671.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7eafbff27---sugupodusopowuvevewifexa.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/59695482578.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zasumatemafedunafipux.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/fetokekubuvapufixuxuwax.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b9c29059---pagokawojumuminebasazaxod.pdfIn PDF document text
    • http://billsky.ee/files/file/1454454266.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/nfj731hvi57fr547odl1hhc7ku/norenoribovo.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/porivinuwetiwaropep.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-14-02-23-40-54.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7769tatvk5fic051lcm4pltfq4/jabovoxokodiz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f9b46cab---74561214050.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_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 11700 bytes
SHA-256: 5c09ec97de3c79351aef6948de1b9f2a77b934465cf8ee57169bf06e5d5a09be
font_01_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE4 21256 bytes
SHA-256: f0a8782abe61c2eb09dab9ff62b466776d526301b99fb95d6fce2139ad91ba84