Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a4f03061ae9a5d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 19:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3285fcc8b3d48f534fc00e16bcab47fd SHA-1: 0ca82ad3178f020dc966ba9314875da8f446c6fd SHA-256: a2a4f03061ae9a5d787bfffabe35b857bd445df5d798e3f3628c2af82ece8cc4
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, with one URL specifically mentioning 'happy wheels download'. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of multiple unknown URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5bba6dda---91428605918.pdf In PDF document text
    • https://shopinhome.com/ci/userfiles/files/zojinavir.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/56865730739.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/55645138323.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/68709927936.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/40114725406.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/vedufurenagikaf.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/sikurisotokupaf.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/kopaxulolugafatigi.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/lugetufoxukugesenijemat.pdfIn PDF document text
    • http://blgjad.com/upload/files/repixapurunorobaleno.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/56497891889.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d854cefe26---xabujurupoba.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/93752735960.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/21377136296.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lebatukifejaxuz.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/vetenezow.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gotovab.pdfIn PDF document text
    • http://rooptex.com/uploads/54084459852.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d57523d5b01233996119b5584f9ad451/guxevomelobepo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/63946326417.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/85371751359.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/matebetibikirobivufo.pdfIn PDF document text
    • https://qnzar.com/files/31890890421.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/95906623269.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16216064226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=happy+wheels+download+pc+windowsPDF 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 10604 bytes
SHA-256: eefe2f1130e37e816befbe2787d7413a9294e4cba44ade7d63a506b11712e202
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16536 bytes
SHA-256: 16c3d01a3ba3124b24083e0b68612afa313e6a56fde344d26af43bf7fe852b2b
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1