Malicious PDF — malware analysis report

Static analysis result for SHA-256 408ddf9a4c8e93c1…

MALICIOUS

PDF

86.5 KB Created: 2021-08-07 22:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81e0b265dba930831b5ff1d48f1042c1 SHA-1: 1ab2ff904f72cf8210452ce27ca2c790b46b7755 SHA-256: 408ddf9a4c8e93c1ef06fa4aa2d41adea84c0abf55ef9cc041b5e24fd7554a14
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the true destination or distribute malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b78d7128783bfe9a9a054de3f72aee60/kedutubogalukik.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/52886541505.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/31920167789.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5884c490d---xopal.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/22626b816745e0a2196403531f74fc69/zixezojawitip.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872c6aef008---52140295569.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/43d556fc815c72c3d40bde25d43e4610/89655090629.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/tomorazilut.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e48611a1d88---18279352611.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/62367664190.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/db212e803f2dc9356f004854016b8ecd/lamojekipiseb.pdfIn PDF document text
    • http://prmakeup.com/Image/files/56171634598.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/64ad3e85b9c78516c612d93a2f5ec8ce/jebekufinexek.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jejesabokosamax.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095af4822729---fowabupiwotigapudiromaju.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/33397797886.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ee64c79f76b7f3eb3c6026443a8921d8/4095688597.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61183da0b8f34014d4ed69a9ce1f8dac/93407169060.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c75875c7572---31724323944.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb6b64bba---30164358244.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/fidesaxigikabif.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fb9221cca9e9e9985374faba9846ba28/16416345096.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5157df99df10aae97237aad9a9ee858/bamezuxadikorufewaba.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/86523712304.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e674128709---jigafonofijufotusite.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/bubiruwajasusaferakewenil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=direct+and+indirect+speech+complete+rules+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16572 bytes
SHA-256: 82c467be2905595f42f9eb8da345c8d84ec2f492196a95492ef15dbf728efd48
font_01_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 10984 bytes
SHA-256: 084f64b988614bfbeeba0919bee384e3f9f6e34311e3b90e8d989ba148a85c5f
font_02_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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