Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1aa4923904fb0c…

MALICIOUS

PDF

87.0 KB Created: 2021-08-23 16:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85f226d1c5ef0545ea86df5008a44d90 SHA-1: 1f4f1137f14c6ab00b54ef01d95411168c66ba9b SHA-256: 1d1aa4923904fb0c17b42eda6533521a1e7a36d7ca171abba3f4b52cd4c30669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other unknown domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/421b492229d97d6cb3ae10a143835afe/dowitoverovazixozepiki.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5a0d22ad9---juweredi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/ruroxegupubapigigivuru.pdfIn PDF document text
    • http://holzweiss.at/67578519374.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/8809847330.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bf873eb3a3d1d1225e7bd0e589e9a7aa/tijikur.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/35791528705.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6fcff19af---61756804873.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/93be1c0927b535e1f61b7a1281bffae6/repakekadid.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e8314ffd78f2e76fbd2f1c5e0035dd95/89146702256.pdfIn PDF document text
    • http://specimport.by/files/files/jikijapimutuzapu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612344cfb6028---wudagojako.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4aedf3d5ebafd42262c05ffedec2772e/13929480012.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/49102752561.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d61263663---jixawunofoxabip.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/1058087255.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/feaa400cd1aa59b4877a407839440dbf/dinutinivegem.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vatutipamimezu.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/rilobutidulid.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abbc4825f8e---zerufajopizuninefotite.pdfIn PDF document text
    • https://dineflon.com//files/30131038693.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/86554028247.pdfIn PDF document text
    • http://tele-video.ru/upload/files/46397098860.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b2fa82d7---getugidevenibaz.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/81749695753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ben+10+protector+of+earth+csoPDF 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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17212 bytes
SHA-256: 8d4f1057fbd06be8e1f02ba47940802bfcda0ae67c0d5fe4f156c41432b3bcad
font_01_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 10668 bytes
SHA-256: b9843a96c912eca156e5dc6b57cede24d3ee268258a15537955f7a053841cd28
font_02_sfnt_off000134df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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