Malicious PDF — malware analysis report

Static analysis result for SHA-256 2780de774752a4b6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 04:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dfe044a1441dd98863e0d68c5eeade6 SHA-1: d46df3b01e88617eac0b1e8567436fb0831dc322 SHA-256: 2780de774752a4b6125602016dcc849ac8a27c64af1f12bcaa2c09c10c3bffe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress sites and disposable domains, likely serving as a lure for users to download further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://caramelitos.sk/files/53376547882.pdf In PDF document text
    • http://splogservice.ru/content/file/78367412269.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/gakum.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc160e9a---tutenobivadora.pdfIn PDF document text
    • http://allasclub.com/campannas/file/42949010885.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/18067557694.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/busit.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/711da9007f1fefd003f7705d09703404/jivurevojobibetugekokuf.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc7efe27bf---36573668017.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c009844bf03---lusidemukinejeza.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/lenagifaletadobuzuw.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/supiru.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/92028275253.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/doluvagefefoberi.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tedexuvepikopanipafeje.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c617c13fe---fugodufegudebunavulolikux.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cda899cd04b---28575079695.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070525a70e57---xuzatewuzib.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7m3lo9m6bdaqggicoeffa2a27/41280137731.pdfIn PDF document text
    • https://banghenails.com/upload/file/81563974459.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5597dd8501---19091133639.pdfIn PDF document text
    • http://fkhd.cz/data/img/17795294933.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea503e429a---90844535158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=form+27d+pdf+converter+downloadPDF 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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 18088 bytes
SHA-256: 9012b60f82fd48127eb95cc23273127ed772d5eb649c23012857708479c6b543
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10820 bytes
SHA-256: 2f005e5073761df7fa61925d7cf5119b63c55e98f780ec97d6c1805352b61fb5
font_02_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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