Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a90e25bd61e13c9…

MALICIOUS

PDF

121.7 KB Created: 2021-07-15 20:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68436cd2b71124701445b7d8e3bf3435 SHA-1: 96cd8c6033c421a88a203c54b93e1333eea7a505 SHA-256: 7a90e25bd61e13c987ca6763f70b996cff3108ff3d97b02828fb0cd8a74d700f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2476b547feb5e417cba3d12768e3251a/lolatolasapivelawovisad.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/aolta8mbks6bm6hql080lc7q2m/visepazobipejogizumarat.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/6801246629.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9055049f468907f76c24b0f1a812d94d/rowozevajakovesefitazop.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/85662437642.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cac910da2---80059780018.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc9587c41---tipigufagumegiju.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akifexexi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/tulofiwugegolusesezub.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/44993700004.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7347773i7b3f548keq2hjc84l0/vamexido.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6jpjgpilds563d3kgf018qftp0/48487163575.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dixidexudarovumusik.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/visiwepawasulupusi.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/rakimoledujoxetu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/togj509en8bor1qhiu0r3laand/gusimituzebobuvid.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/14cuknbhq7p71ejvpburlnvlj6/42459018310.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/24030197265.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/dabolaroxuwam.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e853f322a2---sutaviremexiga.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a074c4db49dfc8fb98d5a80d0082cbbd/35988747075.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5fhtvappt7i8i45sev98jsdj2a/2905967670.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bc00c4442b1d9ae2ae5ef7b9f34be500/dowile.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d167b1d874---warudezib.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc991f3dd2cc8a5e826aa02b603d2c1f/51496282636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=centipedes+and+dogsPDF 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_off00017acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACD 17276 bytes
SHA-256: 970ca645a1299c6f5326bfb065b0abbf898a9fad010efc4f764237985d0bf2cc
font_01_sfnt_off0001a7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7F6 10452 bytes
SHA-256: 2f276ceeb16e99c89ac5fc82966068647d5ff3c6a92e8c016b0b8c1cd8c329cc
font_02_sfnt_off0001bfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1