Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73a14d333127e2e…

MALICIOUS

PDF

95.2 KB Created: 2021-08-09 15:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8123c69759f9504d93a1f5ae6ea66435 SHA-1: 254f210942ebdab96a8245ccc72398c52c244f51 SHA-256: d73a14d333127e2ef17dff63f596ac249573240aaee7134a74865f174628af33
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/nivibebebat.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cebf48ee8ba77ab07edf2c370c284cd5/jegipo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607690e348bf3---kamamigerimazop.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a10f21317fc3083377f123488fae9021/mobosovesazatunoluzavob.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/kavijubaj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160861729ea844---351494168.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/juwiponinobaneridifugo.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/94979126148.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108081023542208.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t86lnruo9j0kk9248uvoi0upv3/21194750699.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/fagilowutezeboxo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d40b6121b---60166088163.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/9711862856.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/21839773249.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/15078098043.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/sanusajod.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43969573850.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/febagalat.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/ninejawop.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c32eba03c0---lixezov.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/visufixijariwedujuniril.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6747266a54---59381386159.pdfIn PDF document text
    • http://ore-processing.ru/d/files/3600582912.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/pudijidopabinoxib.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/mesosusadigefo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c6b056bc---sozerimorosirapofegelivef.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8188504d---30147732425.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/qq6cd34jb114rk9kkrjal4o6r3/90054026235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=slugterra+slug+it+out+1+mod+apk+revdlPDF 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_006_off000101e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x101E4 21376 bytes
SHA-256: 8d0a5e5c1affaec181618e25cca85747e234105ac21c18c38ba65adab5e1dc95
font_00_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 11016 bytes
SHA-256: 3c2454daecd2535a94e81482811c3660a0eb165ab4892ce54f9c7471d0ac7e79
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3D 17004 bytes
SHA-256: 51edb1cb6a0b88d7e6c15a8f804813237b3ac3ad0169d9697b85eaa9d7e48e70

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