Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0167e3f045a9b2…

MALICIOUS

PDF

80.2 KB Created: 2021-10-11 06:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75478951d57032a52f957cfedf813ca3 SHA-1: 1ca73719e810cfbc8b76250773d8eae62a962a2f SHA-256: 3c0167e3f045a9b2e822291dc39b43e5f5345a15b7b64e9ac011dbf4737e6d74
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and is flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://queure.ru/uplcv?utm_term=best+food+for+iron+deficiency PDF link annotation
    • https://hfbee.tw/upload/ckfinder_temp/files/20210924232500.pdfIn PDF document text
    • http://video-cycling.de/files/file/79533889329.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/50214615415.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/zedagun.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///jabaxubajokanilakun.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413bd35f9e---wegatifadaloxuxetajuruk.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/bejipunuxinak.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/kobogolaw.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/sowemezoduwuko.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/18922260108.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/palumurelifo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/bobolitik.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/13067700573.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/pamanakugoxa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616208fc88477---59495270002.pdfIn PDF document text
    • https://subded.org/userfiles/file/tadosap.pdfIn PDF document text
    • http://minipit.com/data/files/3748604200.pdfIn PDF document text
    • http://chromavials.com/d/files/jepebibopojuxole.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/dudanozarupuraluxubuz.pdfIn PDF document text
    • http://royalgroup.at/tmp/pabesopogofamonuxuvi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kkjmovp95r0kstorlq2ltqbd33/89302135621.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/wegedivabiposofe.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/jikimitanidew.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 10428 bytes
SHA-256: 11a38b37b0ef9ef2c80f964a4e07c56a5288c5ebc8502888e619ccac3a8bfc38
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 17168 bytes
SHA-256: d7822346d766c54769e7bf230510c476dcf936b945ce965e7b238db835952862
font_02_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.