Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd031618aee95d8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 12:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d72cea08957d2aef220372e1cf7de576 SHA-1: d626a8e19f4572806caf1ba2e55e1a194d0487dd SHA-256: 5dd031618aee95d8dc1475b3602dc550e05ced27c6fb7d36108474bfa46de44a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=i+have+an+android PDF link annotation
    • http://shinhwajudan.com/userData/board/file/2213563431.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/63317772901.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/xonomigejag.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/80575582339.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/salujusofuzitunutut.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/74746500386.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0b76ee5d6243cf33133e781c2799893f/40861505186.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/ziritolapisep.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/ramutunokudom.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77f1ef74---vegizurigakigumikujusobal.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/ruvuzovupisu.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/39680306584.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613debc758015---kosanuxez.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fawikolesidififajoso.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405985bc6a2---bosanexijabadezepazula.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e04d96418a29334289595a9ca87b60db/18571006219.pdfIn PDF document text
    • http://tykhchem.com/upload/files/lulomarolobolujewuxufakug.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/jisev.pdfIn PDF document text
    • https://birotex.rs/images/files/gizakagasifadej.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/zobefanejovimorulukor.pdfIn PDF document text
    • https://membermimpi.com/contents/files/88104432167.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/kixitusun.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10052 bytes
SHA-256: 8e68c9249face86544af430c699b23308deb3fc16682a3bf10d45d9ab1958baa
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 17296 bytes
SHA-256: 5775577249be4bbe0671a75192eac9b3994cd34388fd842ab7fc456bf7e1cefc

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