Malicious PDF — malware analysis report

Static analysis result for SHA-256 6146ab397e7df9a1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 01:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b77f8ca580900b51b114a80b8defc3d7 SHA-1: 6767429a2db1f175cb7436dbfd9b0c1f6726ef50 SHA-256: 6146ab397e7df9a11296fc4e2286fcd18aaa27871a1ee4c4ce06779b1bcb7ca2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a large number of external URIs, many hosted on compromised or disposable domains, suggesting a phishing or link-farming attack. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ketchas.ru/uplcv?utm_term=notable+people+from+alaska PDF link annotation
    • http://compsult.net/userfiles/file/9730940153.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/17564307868.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/xuriraxu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/200016252213.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6cc963f4881b4d79d8ceb84d4194fef1/rijisevimagolufutu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbd724336---dakadoginogogivoxefofuta.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63c7ce759---58734104706.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/863ba88a76ea18d6818ebf16885ac87a/wijatanexebovedusimo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d053eba2ebb---2901506494.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0a10d1e5f---nosilutelalasigitefutef.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092c00c1df4a---wasaxiwuduxigo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/81954076711.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1da390c607---tivisegineli.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608859009afcb---50969620327.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/58548819033.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9205ae3b6---sadoninivedixowomabiju.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/20322822306.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bnd2hjd75gqoh1jsivu0gg84k0/13980148116.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/petugelotutemafedoril.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/65673805787.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/rokatabenikizeso.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a761e07515b---reluxizaxepa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 18332 bytes
SHA-256: 2e02e3bbc41f98e34ba2ba04ee439459726bcc1f05afcd06eeaeeddf0fad22c7
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 10532 bytes
SHA-256: e948ada2b0a9b4e259d3ec96f3fce34bceaa72d88dc328a93dcd9dece6066354

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