Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2f4fc22a1bcb26…

MALICIOUS

PDF

74.4 KB Created: 2021-09-15 01:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76fb16f5cd0f9c5989bbcad498357f58 SHA-1: d5fa4e4088b557fd28f7114c959c7aebc695133e SHA-256: 5b2f4fc22a1bcb262dd9e05e5499e3b225cb3c57ff0eda81dbdb8a8df8a0ed4f
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. This suggests the document is designed as a link farm to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=how+do+i+find+my+server+address+on+my+phone PDF link annotation
    • http://enidental.com/userfiles/file/20210903113815.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee8e699f7---2307084595.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140806a5d7b9---dekomere.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/61126358149.pdfIn PDF document text
    • http://fgosvo.ru/files/files/25204880650.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/27435926359.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/81763671301.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/rodekiwixudupijudejugofa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/momudefafimodofelogo.pdfIn PDF document text
    • https://makenie.com/upload/files/saxelusa.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kuvudid.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/wixeserupinozo.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pabilebatemawudivikuvovat.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/wuketemosu.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wivimosutabarawutut.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/riwuk.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3ff7b1acd5c7605c1e09df98f165e3d1/54206547706.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/94390812913.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/gotevudodutijufukovede.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jekutipodi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/wenetikobimebigono.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/wudeziwi.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/pijagapogunuke.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/posuxa.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_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 10876 bytes
SHA-256: e10d8d8c948c5604dad5c1d39b7604ffc3f2e6a4408a28d0e513dd9dbbd2a289
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 16492 bytes
SHA-256: af24b92b5d8c90a3ff8fc8ad37f5ae7e173071e76c08637535862f936700d216
font_02_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1