Malicious PDF — malware analysis report

Static analysis result for SHA-256 d164b5150822f5a8…

MALICIOUS

PDF

86.4 KB Created: 2021-08-08 19:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8995dcb4d5747bb93ba6c58bcca6aba2 SHA-1: 60d19f0ab68de8443d43b3581f7dac36b4c893d8 SHA-256: d164b5150822f5a8195563528d3f15dc7589c5c374b7f0c7a184b32bd483a78c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, which likely serve as a distribution point for phishing or malware. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a deliberate effort to obscure the final malicious destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n2jtjd80fv8tj0j1palqkcvmsd/mijasa.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3v7o4073eq7kq153cugafadrjo/zebewavejedom.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8ua3nfqsid4i2ic7490bbld14c/11025097068.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210602_3310BA600EBD3DD9.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wotirilumuwiz.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/tewumenawi.pdfIn PDF document text
    • http://jngf.cn/files/file/17944975611.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/38052500312.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/u3j95n9nn5a3ba2u04j5bmjan5/18935394713.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc21e356ef58248f33ace696cd4fcde6/93738875429.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/000fbf1fcada468b09cec67225f063e5/59755689666.pdfIn PDF document text
    • http://freeorden.com/media/file/83029652721.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/gulowibuz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/06c80941db54e669dddd434090c702c2/32774655578.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091801d41572---jurawosexeloromofinesi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/bakodon.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/20bd8b114ee5bc4d66fce88983b901f3/1446626089.pdfIn PDF document text
    • http://www.polni.si/Images/files/fikagidabuneji.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604c0e69a6---53203387099.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f29b97d8dd5---36721006009.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/3484655530.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/33201034292.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9adc91019f46ee9567f4cf88f6c6cac4/83539035334.pdfIn PDF document text
    • http://timebymtm.com/upload/files/67840635277.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/22879145122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=thinkpad+ultranav+driver+xpPDF 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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 10524 bytes
SHA-256: 722a1260bdcebb274ae36d1d31bc44f89021217f6fcd3e912abcbf2f2d7369b9
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 17632 bytes
SHA-256: 7ef699fcf93d51737a8f2393460bba262310a3885871824d9cf5cce95f72b496

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