Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfb87b153124c24…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 06:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1593ac5ab56a8ba3226a50c39256b1fe SHA-1: a77a9b479cba2656c46c088a332b4d1e31cba69a SHA-256: ccfb87b153124c2473c785332d3cdc18eb8b819dfd94bdea53dae632437834d9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. This suggests the PDF is designed to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b45a0fd28---89441304235.pdf In PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/21648027263.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613964862bc39---22094312413.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/40474236012.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowon.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6276cd5c---telavozizixu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/95842751748.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86439022085.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/pijemogegudevenoji.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55060250635.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/2743514741.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/majefow.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/61337543354.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/42906400675.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/bodusod.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gujevugufemizu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d16986f02---74413329129.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/77908991959.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/27756472970.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/59795941081.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/gaselutezep.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e97ffa66fd1ecb34142f4b016d89e68a/20537873004.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906214932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=intellectual+property+rights+act+pdfPDF 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_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 16844 bytes
SHA-256: 9900122df43e209ecbf8f6013079204af1dd327acbb028c63a5e947783886076
font_01_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 11064 bytes
SHA-256: f6065e4d2352c02990a8ce056f938dfa7b11e23d2d505aeb5853c9b63901738f
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1