Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0021e513ee09083…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 04:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41b726b4c270ef07829d0f2417772b67 SHA-1: 03584113044b2fbad42926b0d646f27226582851 SHA-256: e0021e513ee0908399a067dde196577f027cd04ba177b7ee92b532c689cf0544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, indicates an attempt to execute malicious code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=tizen+vs+webos+vs+android+tv PDF link annotation
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8be3534077af7998b43c85efea05256a/pefanug.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xipovabomu.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/75678203135.pdfIn PDF document text
    • https://5udua.com/contents/files/sojajizirojijataxub.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/91787617055.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zebogisik.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/63358329776.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/nawudunavogazofavekowew.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/pilatuxivomerubefozup.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/27670875969.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/bivularufuvivud.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/keziruxaxana.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/4113912922.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///talokosuweruboxozerobiba.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/durevigubojekun.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d85ae409fdd5a817f974939a11d86741/zebomabewagevefigejuvi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a61ea9d501e103f2613641866314f790/61614962567.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nimezapawamobix.pdfIn PDF document text
    • https://esvigo.com/upload/files/29458869903.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/87616013690.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/pizixusezemupifam.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/16527200045.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_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 17668 bytes
SHA-256: 5e49aaf82c413863e08c0356e5a382ad2b0b110134f7790054b18df46e05a4ac
font_01_sfnt_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 10512 bytes
SHA-256: f573e46f89c0e2199b5f7964992735dcd8a51bde70e53c39d35936211312bd61
font_02_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1