Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f623b05a7ba305…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 16:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22de86172f397d74861cde0fc8c43332 SHA-1: 22b898d163d850fe98038cbaadefc50694f1da3d SHA-256: 10f623b05a7ba305de2a2a0244d36d61744fdec27e3e8d00dd49ea5a8cc29cb9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The primary goal appears to be to lure users to malicious websites through a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b50fad03e69a200d26c0d3a4f0a1ff8/13071216569.pdf In PDF document text
    • http://vanharteyoga.nl/uploads/files/powudomu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tifimoxuvewaro.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/tijeg.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/94175225703.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210830_102557.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096751a38202---linebefexesitifid.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/82437603579.pdfIn PDF document text
    • http://coffee33.ru/archive/file/penofuputezujamodis.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/zupevubuse.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/06cee95aa930427a0eb78e0dafa72132/nubegivaw.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o4meqi2ler8bimsihsad8pubnr/sajadoroke.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/zijezuwu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/jajepini.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/xifagazodoluma.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/96970901987.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/68667969977.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2bbf2a98---68550455592.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c80bb7ad85---favakuduxurijoraxiwi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa434df9d---fepebax.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/zumeweburixomurizaniw.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/resepenopugawela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=courbe+d%27engel+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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 10456 bytes
SHA-256: c4457a05e2a81d9196e648be95fc224bfbdc8e22edfb99f6d1c489761072b83a
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 19028 bytes
SHA-256: c35aa8b4eb767a5109a2397b2cfeb91b933a3a4148c496634cc153ec024b72e3
font_02_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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