Malicious PDF — malware analysis report

Static analysis result for SHA-256 0734852b96319485…

MALICIOUS

PDF

97.1 KB Created: 2021-09-03 02:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: bbc1cc583a6c5dae51500b4c295fec8b SHA-1: e45f3edc994931b8e529755b2275ad8b1472a017 SHA-256: 0734852b96319485e0f7dc07f02b38b66d194553a6eff0d8673c1b4c7cf8d019
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://abworder.com/uploads/files/8369056073.pdf In PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9cb702b1---16323645766.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wemomogu.pdfIn PDF document text
    • https://majubesar.net/contents//files/bewoxosiran.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/vufamuxe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f65454ec---zekeked.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/44918515025.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/19545704395.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160860c7c67258---8656211254.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/sonawenusuwonudivavi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610aed958bb1d---79101433862.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c951a9386c---lexomafa.pdfIn PDF document text
    • http://hydrem.ru/images/file/ragasajunuxidagawe.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/pugunekosetamelugaviwu.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/runizeparemoginasesofe.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a058144d8e0---gedabuzivo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/91520569870.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/19573782026.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443a345eee---jovutofum.pdfIn PDF document text
    • http://webursitet.org/Files/file/99461970565.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/liwemiposimeluvelo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81d296b92---70829939218.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1bced097---36003945523.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/81ad3edcce37577b0f27c0acce030499/tatuweba.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/14klb2p44r9n068qc4j6i5r5a3/nobogevubajuzutazujega.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/givanujamiluzekaxepumur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simatic+manager+pcs+7+manualPDF 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_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 19036 bytes
SHA-256: 270d3fd7a268cbaf32b573b4d4c97463555ee195fbc0f97a6300336929c36710
font_01_sfnt_off000145c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C8 10820 bytes
SHA-256: 65fdeaa1a38414da2490681a81b513db02aeed9b72fa59e64c16d901bac2866e
font_02_sfnt_off00015ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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