Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7f2158cb32675b…

MALICIOUS

PDF

93.7 KB Created: 2021-09-05 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5938aba4deef916f3d323f2581e29ac SHA-1: 418677538f2f9b8b5392f063e4ad691a4f6f0061 SHA-256: ae7f2158cb32675bb13d8f6d4d2347c1fc303e8cdec48b2b448acbb08ceba505
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 or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://xycrusher.com/d/files/tofivurufarodeli.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d1905d8cee3c8768163e8026a4ff70ca/11377907951.pdfIn PDF document text
    • http://konberdbio.com/upload/files/paraji.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/dasoxavinapugam.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/acdd2855646f47aebf666fb851cfb8b4/vemuduziwegujupe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161072b2045322---wavilogizevokuvulimivom.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/47455228517.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161180fcff2fda---48528029128.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b1da9e8f---ruwezosogefar.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/nujar.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021082413592173499.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624449198.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/79501514013.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d20639de524805b7673939e1229d4df7/28027298573.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abc34c4498---botelodirupok.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lukipolovebovaxirajobul.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16275859202709.pdfIn PDF document text
    • http://chromatographvials.com/d/files/vajoxesagafok.pdfIn PDF document text
    • http://placc.info/up_image/39524665745.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/39a7a384669873a1a2b360873ac82323/93341234532.pdfIn PDF document text
    • https://dalba.net/other_files/File/bomoxudok.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/folun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ican+tablet+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000132cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x132CF 18596 bytes
SHA-256: 81f75b0f3c6e3917b0d30ee86391a1840a8acd6802c4b7d752270b928a33c902
font_00_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 18020 bytes
SHA-256: 29bbb308ca0d634529783676d282b6e1220620d8d45e6f77d429bb4225ae464e
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10104 bytes
SHA-256: 455756a7d3f5f5c295e7efa503460937cc18ce283f2582bba23569b66da1bc33
font_03_sfnt_off000150e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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