Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bd21f240efe681…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 03:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 427660ee6ded65c0548f0dccc180fa7b SHA-1: 6d13cf923072a366d63a71b1e35ee21fa327f1b5 SHA-256: 30bd21f240efe6818713f181b1bb7a6aba76b4ea30cad7334ce135fc2a16edc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised or disposable hosting sites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://oancora.com/ckfinder/files/7236539748.pdf In PDF document text
    • http://vikingpaint.com/user_file/file/sobopapugogawewuboli.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a883fb9ff7---49915822372.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/10/64880485557.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/64305834484.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/12208152543.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/muxafeje.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/97304743860.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zisif.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///82225086726.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/18706759906.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/pokawimakabinesupeta.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5bb9af404b2f12a77bb7ed34a7e4eb24/sekomojavepipuvufujogox.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/92503245345.pdfIn PDF document text
    • https://motecx.com/images/file/vuwifesasoned.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zaniwovebukujevux.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/47397775518.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/gunobevolotasiwex.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/69505998493.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/ligoxabu.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/58559702719.pdfIn PDF document text
    • http://hrudolf.com/userfiles/4805612550.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/92252562705.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27ce1aaf04fc85d949ed94d8b5d1f1f2/68101205851.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/36397369192.pdfIn PDF document text
    • https://solturism.ro/images/file/86708263149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jigsaw+puzzle+android+tutorialPDF 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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 16568 bytes
SHA-256: 71579551c10c2761d0fbe1ec8d7ef63c2d4dfb4577873974a17f1720ab4a9308
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 10804 bytes
SHA-256: 91f9691934630ade58623da433369723e4eefce75ce6989e067e5d95c584145a

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