Malicious PDF — malware analysis report

Static analysis result for SHA-256 6061b549e1e8b567…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 07:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6adeb7f5bd1eaa39f0a82836ad671d4b SHA-1: 42ef4a0ab0647dc1b5769a5dc4ddabf83647a7bd SHA-256: 6061b549e1e8b5672482dae6e9f0a3179b7112c2749bb379f8721a4b6baae4b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drvishweshwari.in/userfiles/file/2536259543.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/16163520090.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612db5d39cc66---56812947672.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/74294493356.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/putaporolavomavogom.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a4b676f313595df1c1b9dff290fd227/xupibipesumunojo.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/bumokexuwo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/50024794482.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/nirusajutejawo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160787fe3c9122---nuradu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/17645208631.pdfIn PDF document text
    • https://advik.net/userfiles/file/70855415380.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/972d5779ad7f5c00f531f18b5b5208c1/nisozabadakaselisolo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b636c37e53e---tuzuwagex.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/jebeperitimuwopedap.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71432a99c7---jojowedowik.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2def0433af7294e73af86db66d0882be/zanowixodewerutotovadanuw.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nunalibukofoxogofevasanuz.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/werudagasigetafur.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4080411978b4106c8448db7bb715870d/24026249249.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5fd52871c---xonasapediv.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/kidoluwevotusizakunagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=review+of+related+literature+about+work+immersion+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_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 18812 bytes
SHA-256: 1bc1b0d324281f9eb6eaedd544a3d319ead8e2cb737d761ab2d4470fee20d22d
font_02_sfnt_off000151c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C8 11188 bytes
SHA-256: 74f9cca11fd8a94b21aef00b6c3bd9a23b74888d522e978ab54b1e384841cd21

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