Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44432e717a2e904…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 10:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6576640c9f8ec311906159a76a256d1 SHA-1: a67a0587dcd96e9ecace740219771d883dc14fee SHA-256: d44432e717a2e9040b6a6bb5e63f684e1a0f4d6c5e2385a96ff4344a5239f516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Analysis revealed a link farm structure with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606dd25e04---genikajenudi.pdf In PDF document text
    • http://hongphuc.vn/userfiles/file/82740413743.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/motadatirexuxekebamorusut.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/63596460736.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46570811846.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/71033283446.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210913_221615.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ebca985109c3745f58dc63bdf60b24c2/lukigovi.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/31520728399.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad60e0eb2---mifukumefi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c248441a5---77041721592.pdfIn PDF document text
    • http://beijingteye.com/upload/files/jafaminubolero.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/67353385085.pdfIn PDF document text
    • http://midel.me/userfiles/file/80385297429.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61938374621.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/74801097327.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/43025099900.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/nesasujubu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613694f71fab4---dotezevetapeg.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/72675430428.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/38691723268.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/loxokufogi.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/29326386286.pdfIn PDF document text
    • http://artio.pl/files/files/vaxanukojavag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=format+sd+fat32+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 10604 bytes
SHA-256: 02756d81203a41a554a97e2959d5c0c2743eb88d5f0780043e2dc6da6fe69f3b
font_01_sfnt_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16440 bytes
SHA-256: 8ef09407e0df6c7870f5fd3ae9476bf6ef278dd06941762f233759be2635d464
font_03_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 20176 bytes
SHA-256: e5aac5bcc7644ac067e33728b4d2bac3eb635d8418aad059e8c848c009761def

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