Malicious PDF — malware analysis report

Static analysis result for SHA-256 734d0a3f1b307084…

MALICIOUS

PDF

74.3 KB Created: 2021-08-18 23:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2cc152acc411e02f622670288a9744a SHA-1: 439b7f2991fd4c450489a3d75cabfee99414b2a6 SHA-256: 734d0a3f1b3070847c5e49e89de79c4253c63cab324da27ec2d427c7db05ed3f
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aquatrustfina.com/userfiles/file/muzamuvudedubiborelanase.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c538d63f---54456352111.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/22106274428.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5277d747bbaa99b095331ebde0f0327a/wowikenewizabelo.pdfIn PDF document text
    • http://agama-rc.com/upload/files/romonagesetodonupe.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160828d8ebf5eb---rixebutenovitolujiku.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/zapuzikoxegawojexedeg.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/87394893066.pdfIn PDF document text
    • http://naucseto.cz/storage/zonesoxi.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/58256043123.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/h2pas937opot53rboofaps5atv/49989773315.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84339bb90---99203331068.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0a2rpc2hsj2ep1vjqta6tjupa2/73923447037.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/17749230100.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/tunapijaxunuxejisekadonoj.pdfIn PDF document text
    • http://cosyromania.com/media/file/venejasuk.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608230f4f163a---girelubuxojuparuxot.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/pesagawofiwebavomurepufob.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f175abed---lavilulamitigudanojaw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0ebd87b7d0297e670bb57f6f3e59d3e9/femojatokewixuva.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/db8897a2111e1041e1d8ea53ad5c128d/lufivefezasoden.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/30149407007.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/budovosokowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sedra+smith+microelectronic+circuits+6th+solutionPDF 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_off0000c0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 15988 bytes
SHA-256: a513fbb3dc7c00b253928b403fac787a085bdccc547c3e32595741da2a9994f5
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 10980 bytes
SHA-256: 53ad0674f7918c56bd5edd852ce410b991295a2b2a2745e3d1fa27faf7ff8f30

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