Malicious PDF — malware analysis report

Static analysis result for SHA-256 287ef8f8fe56ec21…

MALICIOUS

PDF

82.0 KB Created: 2021-07-14 10:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: de64117f12d24507725b31ba0be1ab88 SHA-1: dc7e8fbbbdec83601faed4aa0e69a32d6680b542 SHA-256: 287ef8f8fe56ec219fb682dd35ac6f3a3a38834d958f8a9eb74dcc084a9eb762
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cacdb191264fb878de3e0af01ea35e5b/wanapizuvapoxeradugirax.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/19277250291.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d653b992---14186221316.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d0a862b5---50287285579.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/31009990115.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/rovufetavukawomega.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/bigokakinukubodefezedifez.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887c4a3850b---vukuvixenufonarikegadog.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qc1mou14n9pbo6tju573if0r4n/32196398750.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/bhu878snipl5vukdqoup1r1kn5/2525705702.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/17e3916b9c41dc8e9f38c64d9f8caa32/45434928042.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vuum70jafhhvcngli0ern44p96/43036491834.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/98237969775.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/13296159676.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/21026839099.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/03668a09d1951830ace8d04b5f7d7b37/30881844323.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/bujikafevekeje.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/44085430023.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/43496016716.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/75241757203.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/333578dad314ef1bfebc8090a9147a76/23718765184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+download+a+minecraft+server+mapPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17756 bytes
SHA-256: 0874878cd2795f5f2bb2f0256f4bb94f0a9c58fc650ecd21fd6079f1b2bb0f62
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 10924 bytes
SHA-256: 6ccbb61f3ebfe04860f3c71672660e489618ef048951ec55dc6b802d4935ba96

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