Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12943782099f2e8…

MALICIOUS

PDF

101.4 KB Created: 2021-07-22 14:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03b72249b411a4f8808473480ef28ec9 SHA-1: 8ea0b062be3fffa2599b953725bc86112a066618 SHA-256: b12943782099f2e8d59d57e0f1c8ecf03c848f26449fe21c5fde9cb742e34843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it is used to redirect users to malicious content. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3bb06c7a1---tugativajuririnagu.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8553617360---38430211752.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6fea367362207d62d782ff50beb22a8c/2509471896.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/62671538917.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/30d81c1eeb38845445fabf616132575a/nigodugezenam.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160adc404f227c---38389509781.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/tusewuxowagabuta.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/04df16b1b3c03b8f04b4a25294ddc653/sizubafe.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dirapotelodebazigojubu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db1464c3e---furofuwewu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/perovota.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78b26078---vatajurifuko.pdfIn PDF document text
    • https://hgb.se/filer/file/10880885045.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/28625093275.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/luderoremo.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/bapinenokawib.pdfIn PDF document text
    • http://primaneighbors.com/userimages/firebukunitupumir.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/32509739150.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d93abd75b8c6544112857f394095294/62113654453.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0bc12fbe---51172787711.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jn8rmq3rp1c7k1q8akboir9cf3/60595178096.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20a6371e---lutisulikidotipokekef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=is+air+non+renewablePDF 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_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 17180 bytes
SHA-256: ce2cdd64b0dc106d1b5489cb6d8c4dbaf86b61de108b6de05d5def47ea5f6ba9
font_01_sfnt_off000157e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E1 10180 bytes
SHA-256: 4c3cf4fa1c14ab8d2a09348343ad33b009e77313b7ffbb2728ae237e0750034f
font_02_sfnt_off00016ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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