Malicious PDF — malware analysis report

Static analysis result for SHA-256 7715120d432085e5…

MALICIOUS

PDF

77.9 KB Created: 2021-08-26 17:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 323625facbf31d66445b7672b08db06e SHA-1: 4fa8e9fcfd3c5d21eadece2aa9475488397f77f6 SHA-256: 7715120d432085e5dae87bb5cf40d431875384bad52c222a287ac324656e72ce
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8803

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://murzilka.biz/images/uploads/file/vofevejosodogibisok.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ba79ea2---duwopesowobol.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21aebd0fcbd1819837688e157a2a4084/mivilezituxuvugize.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/wakexuzekezawu.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/takawoduvazazizel.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/38971751933.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/mufuvetedadufusiromi.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/wosowo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc68d514b4---75544821262.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/32694468117.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/noluxowinizasonakeki.pdfIn PDF document text
    • http://nensi.si/upload/file/dozaresafapiwefe.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/96802205403.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108191926269398.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02437717c4.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacfd3ecdd---sapozes.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/130314046861.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hfs8k5n0p856mvmm4h79qfon0l/98938693587.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a298d7e1610---jixemijotenunumulonama.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/25369308026.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8067c9b50c---28554225178.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/vejuwilosumed.pdfIn PDF document text
    • https://dragulf.no/files/file/meranurefinesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=subsidized+federal+stafford+loan+interest+ratePDF 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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 10720 bytes
SHA-256: 1737f23813ddbd685a823307087591845441b97ba67bc16de3be2436eef80717
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 16620 bytes
SHA-256: dea1948ca9d31ab1c8365c6175fc8128e6ad3c7056e782909274b5ccc4a806c4
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1