Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d5bd94b601a0f3…

MALICIOUS

PDF

89.7 KB Created: 2021-10-06 11:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 17025709148f81debc2fda7d93c00bca SHA-1: 43c41000a2b4df220e4ecc66ac9bf816b04dee5e SHA-256: e2d5bd94b601a0f34e12dd67efd792ec0bf47bd6a9fe74577ad252cc12fc78c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves leveraging these links to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://akonis.ch/userfiles/files/72475271254.pdf In PDF document text
    • http://mientrungland.net/uploads/image/files/26574982290.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/29776058623.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909125241.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/vujufolikaxazomirev.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615351d059f5c---38340459312.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/48082282277.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461eeb56b---92957466075.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/47961756336.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210910/file/36767138626.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/wuximidubotagarexameji.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/malisiremizoxopow.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/37952433809.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/wajilosejixuz.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/voxexuketepasolazav.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jho9mg4e19e8k0hvp8shjrs4gj/71257688010.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210909233316.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/zibokixajorukujeve.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/25443442359.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/nifewilemusapa.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/bigatalelefebino.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/popubitarifomanirazimav.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tuvazikajudogoxujij.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/99228305562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+widow+woman+and+the+unjust+judge+kjvPDF 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_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 10984 bytes
SHA-256: 09b3c451c30c2f27c073e9113ae78d91feb33887a95ab3c070d930c192eca3ba
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 19536 bytes
SHA-256: 14fa9f389ad83bfc417fd8260f8b48b2eaaac1d813b8da0dfe33c1e6bb8188bd