Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8303045ea9dac17…

MALICIOUS

PDF

75.2 KB Created: 2021-09-28 23:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72d1dc79ed61152a488047d3708da9be SHA-1: 3a586937c19f3437ad938785c90a0413099dd764 SHA-256: a8303045ea9dac173494e4fc4bfbccf9656dd670ad56a72914922f1cdb2a1add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=framaroot+apk+free+download PDF link annotation
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosabiropejorijan.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/inknefutrkhfjv4ue5lnu250ns/96596518659.pdfIn PDF document text
    • https://activepymes.com/pub/file/xagasofito.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210905184813.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/18887e021a4da6187faf0087dd692464/wanonedizakumimom.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/selinosimuwojidenu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/ramelonizesilidatagurom.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/95855588298.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/wemodozudu.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/mamav.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d7213f69d017bba2c5cda2a790a885b/bopuwibozuvimevubi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613abafe4708f---6334279082.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tuvolirubononujokibuni.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630853431/files/tipagovowa.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/gakosek.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd808ca285---12670265607.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/95006636446.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/kaxerevumir.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/25558403731.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161454505c13ea---29004070244.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/45808539359.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/68884323587.pdfIn PDF document text
    • http://devveb.net/userfiles/file/loxusofilom.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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 19880 bytes
SHA-256: 6593720677646fdab70ffbfe0dcd67d5ccecee1b4a2c0f883abfab1259680220
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10556 bytes
SHA-256: 087f161a72e63fcd3be9bfacb19374afdb831ee2993a07928b4c09024f17e378
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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