Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76b89d7dd8beeaa…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 23:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c4406d746ed41be8e682c38321310c0 SHA-1: 9f8e51f8e1c3c040795f6d9dfbc00a237f507bd8 SHA-256: d76b89d7dd8beeaac8cc7d5343c8aa674d097d732fb82ebb5cbfc2d36eb6910c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=moto+camera+apk PDF link annotation
    • https://maconlux.lu/userfiles/files/lekididedufoxenimi.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/88324817696.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/42093055995.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/virataten.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/devolemejuvi.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/13231169916.pdfIn PDF document text
    • https://eklyps.net/images/file/70022614962.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/11497224008.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/64823064046.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/rujexuzomokekagaba.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/59910997236.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c9329ca0---45998329100.pdfIn PDF document text
    • http://hak-al.com/resimler/files/7563929006.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/39901757302.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/28091712641.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/pesavutumoju.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2940d3955---63710031564.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/9818208636.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/mudumarofezon.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631075039.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2741a4e61d2bee98ecf57f5b20fea777/96319540470.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/7111548463.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_off0000c152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC152 10212 bytes
SHA-256: ffe32663d927a82f2d441905da21fc3da8f7c90b552faee974861236e8ef13db
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 20008 bytes
SHA-256: 1eaea7d253cbaa938e6731cb42897cabf9fabe0e4b4429433a511e593c2e7e8d
font_02_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1