Malicious PDF — malware analysis report

Static analysis result for SHA-256 8283303e0183f6a6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 19:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3ed4d3f701b2c23d29dd149d2080984 SHA-1: b8685d4e68a9d0df5848f01144179e48ab8dccbc SHA-256: 8283303e0183f6a62cb7c62ccb189c49dd8fe74399c86784ec79fbce47b6de3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=biohazard+4+apk+download PDF link annotation
    • https://doanhnghiepvietnam.org/img_duhoc/files/58730289515.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345c7a8c180---dazalegujimevana.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210922_230706.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6128a0acc0db84773e7b447a6954c98b/fevokodamolosawivekoti.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/sorodakezumexexubokid.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/96901864684.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kogimaduwukuwakasix.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/trtlrlbj585u0a503vfuo1hji7/39338863865.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109080802165563.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1c4k8no03qioot3sf6a2gshl93/korozivukilogeg.pdfIn PDF document text
    • http://qzgj.cn/upload/file/37246444994.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453b711ac0---reselifa.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/xofarefivuforodelezuze.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kevapitokenitofun.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/61386360401.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/95419477615.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/82331149147.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zipatowevabefanitavidiz.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/jatapalakibekifox.pdfIn PDF document text
    • http://teplospectr.ru/images/files/pizepuzogipoz.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/ramesi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c918b1fceeb9e4c58defdc33602fe67c/dujajejofoduzikixajan.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b898e06f5d84d5e5a4f53cf93fc6b1c1/maburusepomemimesudumuno.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/lamobilezogiluf.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/gelovizofuxodawigizubul.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 10460 bytes
SHA-256: 4a11d5b8b7c7e602355aa1687e88df03f738b7ee28975cf45d827331b2165896
font_02_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 16132 bytes
SHA-256: 748829a8b2ea33cfcbf16a4134252a4591967db65a0b41bcc2d8442dc8d5f926

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