Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae385594990e63d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 10:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b01bb66edc8deda07c740515b11561c1 SHA-1: efe9a68cc3d611792637370b7405890ce4d93a99 SHA-256: bae385594990e63d17398a195c404056a0beb188b9015cbc2d98db5a99d4ade0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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 https://smidgel.ru/uplcv?utm_term=why+is+art+so+valuable PDF link annotation
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bewuwawe.pdfIn PDF document text
    • http://446888.top/userfiles/file/22462784378.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca300724ef6---10909732328.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/wepezukadejotuxolon.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/miwuvesiwedoxanep.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76ec013c3---vejewepitufazezepa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c5e7291d---mirusoz.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/gidofirozowedelekap.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/2336540260.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/dupug.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lufesuwusabubap.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/11042502066.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ad0702e830e15361e7068f65ff615c0/vukaromiforexubanami.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fanns768sthhf252dshmbt1f22/bixewutilo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab893a0e22f---pimem.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/78075992261.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/zixusobulateledegobabaza.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/aa0854972637d36b3e9f9a4c5bd2e451/5432706823.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/6626094277.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a3c87de0c4ded737ba4ca84a90764eb5/59310976771.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9a05b39---vizamiravalejum.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/60610149547.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/44d743c02409775450c2d1160792e085/92130340258.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/sorasuz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b3a352a9---tarel.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_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 18600 bytes
SHA-256: 0ea2fc8de0cf8b38cc2ccc1614d130d2e8635c7b3db9fb9d65206bf867a7b7de
font_02_sfnt_off00013812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 10516 bytes
SHA-256: c520d77a3c3a07c0e71aafaa09eb2dcfee72394a8bdcaf8f77ab40c902180dca