Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aba73828753efb…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 14:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44eeae081a0800ff4fcdca11bbcf8808 SHA-1: 659c9bc30c08e56908b71f5d6be50ded2ebbe1fa SHA-256: 42aba73828753efb6d161f8aaa2efcf8bc15a94e93e3b348bc07a9fb1564dbf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF links suggests a phishing or scam campaign aimed at tricking users into downloading further malicious content. No scripts were extracted, but the overall structure and URL distribution point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=what+are+the+symptoms+trichomoniasis PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/97125599880.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uxabomakubuvadesotukajed.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xirogobobuzob.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866253a22dc---sulitiwajubekisibiwipofi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0fc6e81c---kurazusom.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608205d2dd437---92648518975.pdfIn PDF document text
    • https://isosklo.cz./uploads/nelet.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e6d69529---50526096510.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052619464173499.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/saxurusipujoperazopuzim.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kojareja.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095f589d64c7---41858179106.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b63842669---21729110462.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/29928967700.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/2402605498.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bec2039c814---ranosuzovuwazeleluda.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6c109f4edfe962def7c4c30eb921c205/97871786382.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c07c758548942c6e2f63aea47d49a3e4/pufinapaxotokisaxozu.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/87956863314.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094782817783---kosumakemirurebabarizigu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfba4f26a8---fojipagus.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d364cc00df---gupada.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3phn5lqldb0gtebeildm9qpuif/37952183463.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 17620 bytes
SHA-256: d67c3d300cff2d726748f2c6c24704303841929a9f103cccb84456b80c328adf
font_01_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 10700 bytes
SHA-256: f2094d8be78660e0c2f86ab03d0699b80ddb57ec90dbdacd677eab604a050a11

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