Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ec5b99dab4fa4b…

MALICIOUS

PDF

88.4 KB Created: 2021-07-24 23:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2653b9ef13b3709e6a5e6d029f57b232 SHA-1: 88ecf77835d0802adc41b7352c9d241a05635056 SHA-256: 53ec5b99dab4fa4b7d8131d918daf97fcfdb79b065ac5339a2150694c69a9d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alatheir.com/atheirwsfiles/file/6402395288.pdf In PDF document text
    • http://anatolianlgs.com/userfiles/file/48890284443.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/pixasesopufudixakorevo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b558196651c---wisuvuvebete.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/np39aqir58190b0gnp85op2t0i/75255231792.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc6f39485---todose.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcec056a2b1---ruxir.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818b59c9d4b---xopefegamov.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/11169633242.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/61690943029.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/duwabokazefamebapujale.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdf76b5d5d---xelutowokewew.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/piwosupot.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b7c5094292b1ccd83cb73f0064bc28d2/gugipinijakikopamene.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/worenimuxupudatupob.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/mavesarazugumorowiwiso.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7a6b8407---59733045568.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/filewurenapedeso.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/baduvitip.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d8e2d2ac---77645651780.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/03d05e31ea5d22598a4beecd3d3f44cc/bofewolapenififi.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77815a56f8---fudasinebolavemibumivug.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/14611076446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=emulador+de+android+para+pc+fraco+baixarPDF 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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10840 bytes
SHA-256: e53fed7f6d159b50bc4d14bae38c6c9e651f4dc124034f42c6e838e499e35291
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 18760 bytes
SHA-256: 98954222a2be38888789b0ff748115c1e195666576a2208dddb99556fdeb065e
font_02_sfnt_off000139c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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