Malicious PDF — malware analysis report

Static analysis result for SHA-256 993aa685ffb05d90…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 15:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 234b02fa5692ad89be28895c338b9bdd SHA-1: b0f11ca6ec06b01752cba58c7dd9cedcbcadf419 SHA-256: 993aa685ffb05d9015ac76d6f81300d1595e31884a8005d72e0382b99adb6a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to various websites, including compromised WordPress uploads and disposable domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://philabc.ru/uplcv?utm_term=how+to+use+qr+code+with+iphone PDF link annotation
    • https://fo-prefectures.com/pages/files/67931743720.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/80116904227.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe3a5fadbf14e52a992691f927049cc1/66182583112.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614598f88c70e---77129207903.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/10744640681.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913100155026.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/22087521562.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/jozagefisewurad.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/33875799317.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/65590266787.pdfIn PDF document text
    • http://creationart.hu/files/file/dasoves.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/punipagijidunaxapax.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/30265665890.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lapidabu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/578def2d9575f75d68fa53631aa12139/71426420544.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/walanegilakovozo.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/82855582236.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/95155165777.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/36673523681.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/pafivukosesodajolijoleg.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/larenaxutibobizub.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wowirijikin.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/70639758396.pdfIn 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 17112 bytes
SHA-256: e6cb9b2de30d88605106850fc0bd2d67d75a62d01cd6e4f5882d8fcb89b61705
font_01_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 10724 bytes
SHA-256: 2c25e8c9c00cae0802b1974fb986da0300490924030e3d8ed6c49740176e03e0

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