Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad08da9b8ef8f846…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 22:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4f40cef44936f43739f17ce37bd427e SHA-1: 0565a20b84fb6f5e0707f7c4faa76634d4ee7e02 SHA-256: ad08da9b8ef8f846935f254ac123af556193bb293c4bae57e489df7b343f9719
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of these links suggests the document's purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7447

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
  • 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 http://www.eatvirukai.lt/uploads/files/kaweduzamagedovoriso.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea76992cd---dakukadepabafewurix.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mafulavuwezab.pdfIn PDF document text
    • http://accronline.com/userfiles/file/83669096982.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/pazelufarakoxidapowasopu.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/sapifodeva.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e785b27367f---rovuluzipofevewidumeliw.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50266822424.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbc023de3---32233928826.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff040ee5d---95493592787.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d4ad935a79da9d296d58e0210fc5d81/vigufibodimedizuweketi.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/40999003048.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c7af379d---43398441583.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/98886744956.pdfIn PDF document text
    • https://lapiadinafelice.it/file/22792020841.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/talobenix.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/73518577962.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/wimijumijijuginevef.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/76121765044.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/nuzuninuriloxuxun.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/turumupusosikowoziv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607471d8a5d83---gapewuwofakojar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wernicke%27s+aphasia+treatmentPDF 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_off0000bf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF45 16244 bytes
SHA-256: 7f571c35bcba338b2713ca2ce3ebf55bbf401102e378643ff9abf58124d1686e
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 10592 bytes
SHA-256: 5db14feb749df66e70f201d0e82941ccb39c613c720714a6f7ee12dbf723c61b
font_02_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1