Malicious PDF — malware analysis report

Static analysis result for SHA-256 92575af5b83207a6…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 23:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7781eaef1e04af5c91315c2efca7460 SHA-1: 15c78b8c6dcb039c25bfa099b4defd2475495e39 SHA-256: 92575af5b83207a6d4ec3bd314a58e612b419bfa9e8c4ae14d1e082fdebcc1b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of a URL referencing 'carrier landing pro apk' indicates a lure for users seeking such applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kh5pl15ss83ttvruj27v3dtiu3/94623597502.pdf In PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/vixufozigup.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/33039461157.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/goxuzerezikewiva.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/61805830226.pdfIn PDF document text
    • http://kbchina.de/upload/kamape.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210904005044383666.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa61d97a46650790483166d395f35c46/mavorudol.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a8ad0225---biketatojetidubusenone.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/df7esefucvf65mi2d1tf72eusb/felavut.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/denurusatekopasog.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202194160396792.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sosovasozoj.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/jowefivafugafasijamij.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/muziwimig.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/woxuniduteranedeleji.pdfIn PDF document text
    • https://phunhai.net/upload/files/67230328502.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/32462776209.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16a0167eeea1625ff1f5dd4c379fb863/zurul.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/modudofi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zemisadasakatifewun.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210912_ED35336B6C3A747D.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/fapuvezufexin.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/27395983163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=f18+carrier+landing+pro+apkPDF 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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 20644 bytes
SHA-256: ebe7619daa16f560aaf2304b2515107203bd89f71370017a2fe88fe432d0e532
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10752 bytes
SHA-256: 439a109292f7851749d78836294c24993a05dcd6caf515cd677662eaea76436a

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