Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b262552d338452…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: df49d714ea5e1451ee263e66f692c128 SHA-1: 1f61c88aade02abd6d6bcf6528a5c2914b3f8f05 SHA-256: 53b262552d338452386886fa725cd453ffea94670c7473de72bffc6183383087
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress installations, suggesting an attempt to host malicious files. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seattleteriyaki3.com/uploads/files/2893248470.pdf In PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/najiguna.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h672s5bdc2j9i3rri050s9hos3/37601535972.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074362544e4b---dinijer.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc4f4943a---41245231998.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/rivibetagobopokuvuvap.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6449d87f0---55013704512.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/kudugiwufuvur.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/jodeginujipivebagib.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/wakozageje.pdfIn PDF document text
    • http://fygl.net/uploads/file/280848414731.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/xakoxejiboromelode.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/rixugazeva.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0eb1a0e2739ffcf4539fd9af77d3922b/komukekepasitirisifela.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/17381773692.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a908644b248---mukuz.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vebezibexutose.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/30694268510.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • http://www.db-ynox.fr/ckfinder/userfiles/files/serilasonusawimilujul.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/gajibijosowipiteba.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611987fe61686---26317954252.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b83088acc---gafajonurigagub.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772ba3a5be8---96383977196.pdfIn PDF document text
    • http://mvpvo.ru/userfiles/file/voverejod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=baixar+curriculo+lattes+em+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10932 bytes
SHA-256: aeda2281395738692fbdc2c065c6d59b74e91db1cb43a3223c5b9dfd431f0f94
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 18180 bytes
SHA-256: da72f0c5c436d7a4c3356a974e94fd6107587d4e9a6fff393fc1321e5348b351

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