Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e9d5779479a695…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 00:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7dde34e57a1d3ffde60049b72c35e0e6 SHA-1: f42d9a93cc6fc331435b5a7d4315bebab3b1a4bf SHA-256: b1e9d5779479a6954cf74f146ac76e5b4a5fe6e1cb02755a5ace41eb543655f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=color+blue+printable+worksheets PDF link annotation
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/wowekuwujudaxililorupej.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/95869329407.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9aff4ac15---kodemudetudebukavivepo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c0ca7fa265e6a69cc19459643060c238/3193669749.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/bokigovijugejove.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc8cc847d6---30791671060.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/gaxomekorupetulit.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b0815e275c4560d823e1d03338cea7ed/sonosimuvivosa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d91ae9d41ea8fbf83831a9d213919dd2/dumizerevixapuxigudone.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865c1a7e89---21305662702.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/mofutogajifotaketoregume.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qa2u7oekdvqbjb82145lmjqrk5/20170560500.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cc2e8fa169a1509aad6952305c30a8cb/toxodagodorami.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac441225f05---67500763772.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/12495637442.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ac4474b---merorijomij.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/19046700021.pdfIn PDF document text
    • https://argumentua.com/i/file/34468458464.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/208014255.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785a8a80b2b---23987923028.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40225678e5---dudogilijunovawat.pdfIn PDF document text
    • 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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10800 bytes
SHA-256: 67e0e4da804c414656e9a3f332a4940ab053f2d29a88e6a534ea1017eeb9f7ad
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 17920 bytes
SHA-256: 5e6602764aa815f354824e92218f06969546976180f36b50192c6d4e32c30938
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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