Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37fae364b49fed7…

MALICIOUS

PDF

105.2 KB Created: 2021-07-17 16:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29b32b68079c7ab58ebef40066066134 SHA-1: 2cbe1375367215f5351371bc7fe050bb8cf5b27b SHA-256: d37fae364b49fed7aae7c4a9062538764b6a72dc0ad893cf85b51bb554ac17e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://elitstroycraft.ru/source/file/31852632930.pdf In PDF document text
    • http://planetamama.ru/files/file/wubowejiwana.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/7594094120.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f1113f4c7aedf70e912975ea500339e6/18909976957.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a213e4ec2b95aeea14bda78eb3ce1028/lorimumir.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8dccba5fd---duxojawoxogi.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/18102024434.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/84379771049.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xatigikudemixe.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210704215614_zgnkds.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/83185327434.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/voxufivofenakinefalupapa.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408f09a8e---9994511167.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e4ca58d0e82cf49e8b24cc97e7441152/77372846898.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/lajomuto.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/50479888952.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bd7c4bc0de9e559f4ab451e385186876/buzejiwolox.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/16287153656.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e85882314a2d7c1d3fe45328a70924b/ponipatobalozirolo.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/tonepelarezex.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/8eapjd5eocv3u04nrgjfidiga3/lilurawonudexufenejira.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/49908670633.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xefomovofapuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=whistle+away+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f09c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF09C 18660 bytes
SHA-256: 6d088c86d22b1ca2776f2deea79ec884cfdd59afad1717475337c5f47c3b302d
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 10528 bytes
SHA-256: a15f3331257f8fd374a50f811b653c881710b8e6bcb584793839274d1901989b
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 28704 bytes
SHA-256: 7b940edb6f1389524b4b4e1103dd81fe9294d573cebe476330f3ffce7dc1e83c
font_03_sfnt_off00016bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEC 4664 bytes
SHA-256: 3b0b278bba5c2449a0f53c8afe9e74738fd0e8854de018757e69a02a20687163
font_04_sfnt_off00017d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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