Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb4779343e9dda7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 23:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95f709965ac5f23b55ada55b7f2bdf63 SHA-1: 97cf985ae0a19ce892d4e0f961a6babf46445593 SHA-256: 3fb4779343e9dda762657dfef451d37a310d1383bfe794cfb6f6e160accabaf9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules specifically flag link farms on potentially untrustworthy or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://cdmatik.com/uploads/file/dadijupu.pdf In PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cdb5789d2---figatufafaposesipug.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/27527425504.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/56053528903.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/clqevmmd6qhias48q970587nm0/koralipapotesokogelurekav.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302df6c163b---45496602942.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tegowibunaxadixub.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/ropuzunutonajunavubu.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/goxibuxineki.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/35312498437.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6177b00b---55171047749.pdfIn PDF document text
    • https://priscar.com/documents/files/28001526443.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/vakadutunaxowojogugan.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/beluzekutobanimamisuze.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/likedepazukav.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/ludugawujufigun.pdfIn PDF document text
    • http://origo.ws/userfiles/file/gabosubadoxavasexekuso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fb568acd---58050422323.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/kezuvupopezalagitexabe.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sodokaliseliligumodexa.pdfIn PDF document text
    • http://a899.net/userfiles/file/62736418091.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161307378de19b---96840484106.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/josuvilovezojazasosop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+free+for+apkPDF 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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10344 bytes
SHA-256: 00d0e09c7091e9274bfa85c72d65e2e803ab6b9069d482ceaf9b152d48e4176a
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 17192 bytes
SHA-256: 9e2019198a4d046e43ca0bdd946a885192796fd0a1a9108e1ec87195d8f2198e

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