Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09b2a586f7467d7…

MALICIOUS

PDF

97.3 KB Created: 2021-06-26 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d689a915d4bff942fc5f94cdda3f9755 SHA-1: 24660f3cde5f0270eebf67ddad26c5525d3d2d74 SHA-256: e09b2a586f7467d77fcc1a3ab65b5d841e4422730a78b86dc0d1d3758faeb8e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8be024f0---moxabivoberot.pdf In PDF document text
    • https://maintogelonline.info/contents//files/7174323271.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hn0vm8nsp3n5ie95qj073bt6gv/boxanavexivoguj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072da7d495a1---guxafipusekajixager.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/43267ee6946c73b4d04768d1a7d1beb6/52846807576.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0029f064d---15715005911.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab88282e6---gogomezefifuzuwazele.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xemakozo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2mgidue92tru517nc7nf5grbdq/jajupadepezinasoj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/683a93a90372b28220c3e86ef2896787/9831424102.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ladelaposisado.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cadc3fbf7---daxirab.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/99579f24c7698b5bfbd9c2f32fe2fd63/17528469395.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mical8migkf44ducat65e2n83m/37465145213.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9b0308f2---wemoduzevuja.pdfIn PDF document text
    • http://irollee.com/userfiles/file/10978155011.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/09d95257e8f7c2df36c2360fb35b6e6b/57277003337.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/931226280b4ea3830127b67510d4e1f9/batuberapipilejajonoro.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f6bhm34rv2ubjr1hrb5vbr9591/77826643691.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/83238518600.pdfIn PDF document text
    • https://sambelteri.com/contents//files/68522454197.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/29178234032.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/56975d08d6daa9ee691c665117cc2a8d/68065747170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stromal+fatty+infiltrationPDF 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_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 18592 bytes
SHA-256: c73c44a99312657d25758ac0fe6e4e6eedededf28be8e16ce31f6ff4162e0007
font_01_sfnt_off00014770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14770 10264 bytes
SHA-256: b4624bc13f07e58829c2fa4d204a8cf434685acf03f0a1daf367c093cebdbdcf
font_02_sfnt_off00015e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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