Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e32e4fb8253a814…

MALICIOUS

PDF

91.7 KB Created: 2021-08-15 00:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5bb3614ad62e9b5160fd7d94360ffe8a SHA-1: 1371b45b3c41a40ff63cf14a4c19841689892e46 SHA-256: 3e32e4fb8253a8143a29276500097a00a7f1d312a04f70ed3c0dc78530af4d5a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f96cfe3848729e00f6529da1ac9acc0/merobepidapakumorid.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e726f356---68471716168.pdfIn PDF document text
    • http://attlas.center/userfiles/file/15148486132.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/49538429579.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6bd85665---fewexe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f4acc1c89---mufipoloxofapokoboj.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/3377281912.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91d04e777---51599383592.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f074dd502e083b646563cedd95f88277/70086607929.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e0adc22e2f81c7a36737273d47d8af3d/vomapaxeki.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a5b68fb53e4700ce135a6d4f3cb2fb31/xovuzaw.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/40384930839.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xajigatowufegam.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c38612238---69814604386.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/xozawikamajexodexuparuv.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dr6jut4soke6de1q77ehjgncvs/wogakosa.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/moniluwibebudurivapezomi.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/3341580914.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6675a46a3cfeda5737ab4a418cb15259/79823423382.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/82443703053.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/lijuzakinogifiguzugetezo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03962414e2---54049041191.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a6852388b---47978671137.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/46286454359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+lagu+dj+nofin+asia+mencari+alasan+mp3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 18652 bytes
SHA-256: 63aaf4c1514a02f3cb7e6abe87fad5bdcd00e934064aca6068270c36ee0882aa
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 11352 bytes
SHA-256: 4d50f5f56c9eb827f2474afb2d728e7a4175308c463adbd7cb0077df5104d70b
font_03_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 17840 bytes
SHA-256: 8bb275d37c7681dbd9ddb1dbfd9f654606bb28479e522aa2418527441bf957c4

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