Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59af12d07277db2…

MALICIOUS

PDF

75.8 KB Created: 2021-07-04 05:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1e754a40ba7c9393e3f33b5bc5d85d49 SHA-1: f6954e911b906c9c3837d10004c60e4f3313f4bc SHA-256: a59af12d07277db229ef3d72410571cb7d79cf5c6a8670f0dd21331bae9507ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3d158f6692d800504dd6dafbbbcc0340/97483429205.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9kr1qf8jqcvmqreifcue74ac6g/5755055006.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/15879222410.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/db0167d36db13033948f94144047ab64/nigasusojojalepadisesako.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/98232028243.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1d5b8c9e---26447045199.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/o3ca6cam4h2up111480f8vscb6/neredawurumeradup.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847e073f8d---nezakaw.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a661d53a299---30331941258.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/kugumezewajawiwabaj.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ephsih9c8d85n6elmk8vote0ro/lojogifi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf37c73b2---remekobar.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t1bgb160tkahnun0m9idbf2k6m/dozilabozuzimora.pdfIn PDF document text
    • https://codecs.ro/images/file/28978450671.pdfIn PDF document text
    • http://ruihuitax.com/files/file/60499891072.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ad8070a---92697185738.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/purekuxefibirikofawoda.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/78417000424.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cf358725---kijizamelolufudejataxoto.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6275708d8---serotefe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d252018e09---majakoruluk.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a285f32a---38985886214.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/49070926853.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mfvqc0121hgri8v0ah2o5vktpq/89106384875.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rajikozexebuserisef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=one+word+for+many+pdfPDF 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_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 10480 bytes
SHA-256: 84b412038808c116ea251a593a3ed2d7a28bd41098e2476e87ea9eb0a3722775
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16580 bytes
SHA-256: edce9c6b66f3320735c4a3b8f82d2f1e33938a7ade543875fcc312521e3fdcab
font_02_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1