Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45348fbb969b311…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 12:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ccb43c94924316cd14479eaf50ed42c SHA-1: a372477c0c3efafe2c990c3a7ab85067e0c2905f SHA-256: b45348fbb969b3114032fe9527feee01a7e732fd83475c7508098bcf93e87cd3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous unknown URLs strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8674caf8653ef01fca48826b845c4049/14843776085.pdf In PDF document text
    • https://clubsecurite.fr/webroot/upload/files/26403667078.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xifujum.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lopejeroz.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/85989639751.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088074b1d9a8---kolerivoradotemapetalur.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/didurowujikukekaxi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97c50d61a---54982369759.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/gupewamogisunijubetog.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210518055314.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/paloxiwadet.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/51291397922.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/mibuvu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9abg3gnfktrnbvnmtqsseqcim2/baletitix.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160836e1d2e0bc---49272106332.pdfIn PDF document text
    • http://herve-coiffure.ci/files/mowekatifuvavamutuno.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/34780aa746ed27c43002528fa1cd98f4/6759673948.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608049f7585c0---kinosadoxazoden.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/kotineku.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/41853742483.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/26a984881132694151330493fa448027/zuxolegexusagavujuzifu.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/21433046824.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210809101643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=b1+reading+comprehension+multiple+choicePDF 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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 11168 bytes
SHA-256: 779cf77a2f0f23f8459bbfc6f7f60971c6f394fa40359b3f414d47d418b2d844
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 18992 bytes
SHA-256: c8a99f4513cccb1c9a8f72d84e753435f3e57e4dc7791cfefafa814bc47f5c70
font_02_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1