Malicious PDF — malware analysis report

Static analysis result for SHA-256 93223fe4d1517635…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 03:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0076f1a81ff3f2027294f373e78b4da0 SHA-1: 9c343eb711dd6a78e809f872eac3893e17e59292 SHA-256: 93223fe4d15176350a281c8db9ec7358737f96a8dab259eabd8aa5e1a79f639a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6720

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sanarina.de/ckfinder/userfiles/files/bovimimawuwe.pdf In PDF document text
    • http://bebsulmare.com/userfiles/files/xurigemizewu.pdfIn PDF document text
    • https://castel.ro/userfiles/file/87301421434.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/54919041490.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xukufijuniwalejibekit.pdfIn PDF document text
    • https://socardan.com/userfiles/files/zuvorot.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/93360344994.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/gokuwe.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b1e1b73d---fagosexosorozejunedefu.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rajinux.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/81259038048.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/97434130234.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/xijopo.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/lomekar.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/kobuxatevuzuv.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/kukokedosopigotanobori.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613461b22a855---pitazexotikisepunu.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fulebapikidoduwepesi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135aebbcc1aa---65573329859.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/49349291221.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/wuginomufaketuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+apk+file+of+android+appPDF 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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10660 bytes
SHA-256: 2cf990e36f3a35aefee8e65066174437f42dd90eb583b248210bdc3dd655cf01
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 17120 bytes
SHA-256: 054ef2a7d445c8cf7f414e128615c790a0e022cc141c5f46319718bc582bb050

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