Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd20aeadfa6f98bd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-24 05:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18ac1e4aac2b2dd3c52a038ef3930228 SHA-1: 2b3e03ee69f4b149ea3876f0d91908174c9d85eb SHA-256: dd20aeadfa6f98bd07b5ddd5a353bb2027ca32496cd0baff8b5dd7f08be8a19b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, designed to act as a link farm. The 'utm_term' parameter in one URL suggests a lure related to book downloads, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=after+we+collided+book+series+free+pdf+download PDF link annotation
    • http://chugguwang.com/files/fckeditor/file/monumefakosinafasewe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3bbb93f9c---lugenifopukawu.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/72643265424.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a6ba9db43---tejifadaxolo.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/timofojemuvobibomijemupab.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/86101231106.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/38394089160.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10720733558.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/45673907144.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/dipewowabo.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/kaxolezin.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/39038414202.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2498c840fb9e8fa8455f4a55682fab25/21472442456.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161498f4daf954---milerikibapetifarulowefa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b7529f9cd806220eef710e9c45afe639/25417234828.pdfIn PDF document text
    • http://holzbau-napetschnig.at/vubivolotamo.pdfIn PDF document text
    • http://polkovnik.su/upload/file/57452696406.pdfIn PDF document text
    • http://zenithmetals.com/files/42304280412.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/nipizavejimum.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fm2gqq41ne2ka5nc4b23sm5dh/63157774699.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614d36546ff9c---91799638914.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/89918993004.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/34967036674.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/51924475887.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/larodijupajabonav.pdfIn PDF document text
    • http://otczenacts.com/media/files/43286516498.pdfIn PDF document text
    • http://zxsolar.com/d/files/zugalibifuzeriwisora.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_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 17460 bytes
SHA-256: 10a51b02ea7296daddfbc32877403be79cd31180a75f63ba00af9418503299de
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 10912 bytes
SHA-256: 48a31b7d53c7f2814af558759b07ad3c00778011e8e508894a98961f59a02e62
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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