Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f5e254a1d71ed3…

MALICIOUS

PDF

87.9 KB Created: 2021-08-22 03:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d20242e7c54ba9ad28fe186af8dde931 SHA-1: a5a252cd6d22dc83aac4be4f5eba24fb1bdbd54f SHA-256: b4f5e254a1d71ed3efebd19cfdc333c3aea97d4fca4fd6a00b18ec1102631012
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. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://inwebjor.ru/uplcv?utm_term=stylish+text+apk+apkpure PDF link annotation
    • http://wingmanresearch.com/userfiles/files/98349268949.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zosotijuvusogafiza.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/65805568281.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1704efda5c6626b91c049fe178f285d3/43884709351.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lorewemufol.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3358b16834b68da08f7084edd4ebc043/50820393652.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/lepegujedakivexivib.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/bafewotolegaluwokefuxaje.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca332315c4---sitakozofubalafot.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/6605711067.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210722_C6B24479718EAE17.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/79354694603.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zilusufil.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d38bac1ec---46143776425.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108211932331494.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/78506042279.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tanaze.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/ridodezudasowabel.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/41500606962.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c80b5f9e---74700129414.pdfIn PDF document text
    • http://bctlorraine.org//userfiles/file/xejubogabisaxetakefasew.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sedemamameja.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/nozawagowizakurunovup.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79e392346---23024531287.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/datageribapatalikabar.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/222075b3fc0b2addf80e541a941f8e22/vitixepoper.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 18832 bytes
SHA-256: 9cb6ae4eede7e2eb2aa2ef49dcdd35ecd38a2cea2c3e8c4b63369fa32b2856fa
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10608 bytes
SHA-256: eeae5eaa5e534e3b88be3529008954a0bca7789f21c0dd42dedbe9919d3892d1
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 16480 bytes
SHA-256: 4ddf446a29ac6638a36f63cb5c8bd7b82892d1ea8ca26304f1f1071c676141e2

Open this report in the interactive analyzer, or submit your own file for analysis.