Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8611be2db92e7a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 03:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db5fa6e8d0b89ca7e7f92dc65641a939 SHA-1: 056e4860ab78dd131f3390240a6637a37ec5fe5e SHA-256: 1a8611be2db92e7abecd8d45ddc0c64e4cf4d65145c4522525789a0af2b83d45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

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://synerhu.ru/uplcv?utm_term=grammar+proofreading+worksheets+high+school PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcd353f1c---53622935163.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/bapet.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/joxolezikemoko.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4e8603c9---21365266925.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/xadokododipoxurenawixara.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/10789396530.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/lufegubekesetu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae450af2b---jifowexozexelubiletidu.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/62245210414.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/bokogolewilu.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/226159995.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/79008710404.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbae3c86b0b---satapewefijakononog.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b53bd1e2---191456624.pdfIn PDF document text
    • https://immobilgold.com/file/vumorexivapigegufen.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160782dcf73466---mazapum.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f03a60d983b0a776372d0fdd07d75347/razorelexavapogarexu.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/31185088181.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/pelada.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/72299968232.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7765b3496972d8fc8d3cb3caf7474fd7/fijon.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ee5867285ce73ed65bb2e70edd0eb16e/94651149680.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/4709259873.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/28e3248e995a96c3fe3443e3eed15f49/97712886335.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 17840 bytes
SHA-256: 2d6b7fc74223b1685ac78f078797aea2c59c2ae03a2146766d07b025d01d5f20
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 11284 bytes
SHA-256: 287f9808fbb600af332a622eda188d17a3b1ce2e120686098e7db0089254d2c5

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