Malicious PDF — malware analysis report

Static analysis result for SHA-256 556730a4436da932…

MALICIOUS

PDF

94.4 KB Created: 2021-09-04 06:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a14c0763e8c498ae59a4ea85802d3a38 SHA-1: 10e339726f1279c27a318b1cfad386cb56949af8 SHA-256: 556730a4436da93284a161622fd43309110a622024d7f65033e3b3671cf33ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://morard-mcf.fr/data/Files/teseju.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3f5bb777a931e5626cef3bb998de9394/konaxegaje.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/risemolutamunapadu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/um0hteqbsn4en2isjd37dd48ms/61344124383.pdfIn PDF document text
    • http://oilspecchem.com/files/pajubirogatelapajuwinitu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/noziligem.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/3504161507.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a89b7cea4551b17d3cf40ffc3802cd17/xuzudin.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bca7b1abd---68623874760.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/54375384391.pdfIn PDF document text
    • http://chayka-svg.ru/files/41162964705.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4030378c1---15015032788.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/biwadataz.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/41700748177.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90ceaf026---49918301139.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a88fe4398---77527065880.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/samadabepaje.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d7ed74b65d1745204a23591933bb4d9c/22324915022.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/dafuritamori.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c992b256ed2---lifitidowo.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/bovuv.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/4qrvk0nu58fdk97bl29putrnk5/dinabizovakotelavaroza.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ba60555e951bc76b26abac5f5688779a/44473326826.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7b4e51e4---gajunugojipatuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sap+abap+basics+pdfPDF 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_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 19076 bytes
SHA-256: d444659bf5f711636d1ce70cfb90d96183a3d95345e6b2d19ea1e5e086605d9e
font_01_sfnt_off00013d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15527 10228 bytes
SHA-256: fbf89bfd2b05d77eff5d320d7fad3ac2e37e176ddf43ca345b581d927fb9e731

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