Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a02f5153c4387b…

MALICIOUS

PDF

92.8 KB Created: 2021-07-05 00:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f2b864e2f7bb24aef334899dcd7cb00 SHA-1: 490dec07925419dd585038f19bfe7c5e7a7fcd1c SHA-256: f1a02f5153c4387bacd64f33002bc2f8c4134261153b22145f8aab413ddeac56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for delivering malicious content. Numerous external links were found, many hosted on compromised WordPress sites or disposable domains, indicating a likely phishing or spam distribution scheme. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kuppersbusch-center.ru/uploads/files/fuviwedafokevotura.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7b9e743---jepaxifugizovikutimekin.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dbc2465c---94858841464.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/96epo0uu6shppa9h2pk06gh722/17888125512.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ovqkcdgubdrv6j2echhs184jc7/nuduluperokasuzekiwipaze.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/kiwubewikifo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/24356107825.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/jetevut.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/uoear2pi1a80f8sutje7vui3ct/92441245513.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598fcd22de---zemapenuxazotimexo.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/72its66fcu99g6gkr8kd5fqhuv/jusukijuzola.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/86934741764.pdfIn PDF document text
    • https://loctra.net/userfiles/file/33631628217.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/vawubigowil.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/10/file/20210510_025741_148.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41474bf33---1277596215.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4759a362---lumowim.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0d244813---35473941587.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/48030446627.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607272242bc12---domufogokanisewazikix.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/56532215293.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27ae11e6d---4561124919.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae7e4f1f3---nejedakapu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a510a95c---65132474167.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/fanerebegetodugubesu.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/zazotogoju.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/demivubavovopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+makes+a+sentencePDF 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_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10224 bytes
SHA-256: 7a60807dc53acc8eef90e68cc2438024b66f826e4404ae05881d25c53cf2e841
font_01_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 17084 bytes
SHA-256: 34769596bafa14e0b0a00fc1f8f4dc48e12ea8f8fbea4b4755fe794a4fa6b11d
font_02_sfnt_off00014dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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