Malicious PDF — malware analysis report

Static analysis result for SHA-256 566b5386b883c6a9…

MALICIOUS

PDF

97.4 KB Created: 2021-08-05 14:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea83a5c91c871f2870951d4802ccd557 SHA-1: 62692c47b093e728f0195dab6da1e4c69a4c4360 SHA-256: 566b5386b883c6a914f2c09ea54bf5b121b582112ed05b995e986ac36f158061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=what+was+the+time+period+of+the+middle+passage PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6499e49c4---lajef.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a907876cca7---xevef.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/roxipixotikekamiwomexoxu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/73225845656.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/99171117562.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/zilitosukezuwejoxuw.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ae29697ae5226609037a138969998bde/kugiwile.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96df1e7b2---rozosobadofanamo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160706f38424ce---47218250073.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dadelixemabumu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/poxegijijeva.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/30537254401.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1kr284dfos89e90v6ub5ca29b7/96287363083.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/59e4789711dae2b7bc2647db53a39371/52624359344.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/42134747122.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/nunakikuwijoj.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e72e78c19---44100686481.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/f7r3ilem63ch81d0a2n5as9ojj/datof.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sifufekupojepajonukaze.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c22bde72601---kesepesafesen.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e7f6a2b3da0.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8028317b02224a01c9ff1cb9c86f5f63/74997248955.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fddc11bc---76901231458.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_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 17460 bytes
SHA-256: f16e417db9e64bd8b4fa5f2267e8cf3684fa84d2e08b5760a18a4f2857c40b06
font_02_sfnt_off00015cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBC 10920 bytes
SHA-256: 191ba2e49cf8da79832e010f0b934fb8bb4a8047a7472efdde6537d13e8a4cea