Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa4242ec797bdcf…

MALICIOUS

PDF

132.8 KB Created: 2021-08-05 16:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: affda577036a66f74b370f2fdc0f0b6f SHA-1: 33a390f6e9ca4caf4f4662312c762a2fb6a17863 SHA-256: ffa4242ec797bdcf9be6af3fa664dadb746600b0c4d85415f513776ec21a1d78
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5972

Heuristics 5

  • 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
  • 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://stgeorgedentalcare.in/ckfinder/userfiles/files/retedezigipenigemeparod.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/75467161631.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/wizukaj.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/titavurodexasizekukiv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/11180742643.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d81555f3---papuxubug.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e219cbb72d07bd9f362b60339b6a522/nirifevizura.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ab051f4436324d4b0849f0a273c9287f/53118784136.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6858t1k08v4qd61gtn5rv3inm7/lovuxosaburitunew.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/91f1b3b427bdc53d7a58ac30ce322938/velara.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b42692566e89ac958844ecd701f5ec61/kufofifewofevexuziso.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/wezozitezutizutikimenegor.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/55666098793.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea113c04a8---55471027253.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/10374868430.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/kijivemotokulozug.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/sitefibibiniwojutasifipud.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfada138cb---48381155439.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/toliwugidegupajeputi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a9ececff---bufor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=teacher%27s+guide+grade+8+math+answersPDF link annotation
    • 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_off0001b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFF8 11040 bytes
SHA-256: c1b22ec03b0b8b1a5f69f3e6ce2c12eb22ec9780f6107eb5bf4f5159d9b45db5
font_02_sfnt_off0001e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E96A 18444 bytes
SHA-256: 081d2dfd01adea0cae38216064f58152667097db2fefa0c782d33df254a65f5c

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