Malicious PDF — malware analysis report

Static analysis result for SHA-256 e684466d2a104625…

MALICIOUS

PDF

81.8 KB Created: 2021-10-05 17:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 2a9246bd14a66a004c65b20abe1cb2e3 SHA-1: cadd635c9f99c5709f5ab6d4e4481135c0abc4db SHA-256: e684466d2a1046257ee46816f304f088cb468f6b0fc35a0dfe6adb0d2fffc1e0
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 CMS uploads or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised or suspicious domains reinforces this assessment.

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://junona.manyel.website/images/uploads/medium/delugijolawaxasamedaras.pdf In PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/popuxan.pdfIn PDF document text
    • http://classtool.info/upload/files/rosusidokodo.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/58279507801.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/64309019122.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157fd0fe1707---gabemetom.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/41795569304.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/14400401751.pdfIn PDF document text
    • http://thecuriosityshot.com/37562680130.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54784074328.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16155e413f16b9---fiwud.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe91feaec7---68878997598.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zogorakigatemokexafanep.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/16f6fc44ab3cc2d7780c2ac9db99ac62/27431537247.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/nizamewotodajulukomowige.pdfIn PDF document text
    • https://12tiga.com/contents/files/20591447209.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sozatomureresatomimoxev.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/77811689675.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vubefidawujafulupag.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/50446654701.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/suzozu.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/14044509066.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/96744533808.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_48DA5B44D6F27B08.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16156040871887---60366592719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hydro+electricity+is+produced+byPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 10588 bytes
SHA-256: 379e64b713db0a40d132d4bf23c2f2db3954163bc1c525e8fe0f1120b46ce40d
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 18136 bytes
SHA-256: 9125226e13c7273b6e544ef64299a1abdec91cbffe0c4d7dd9321002818d7889
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1