Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1309c4cb24c11e8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 22:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4078b43913f53cb6cedd7c44d1ae5c9c SHA-1: b6110521fde66048ead12db650a3ddc3e43ba7e6 SHA-256: b1309c4cb24c11e8aa50c5788c37fe306a2dc1284a6004260d2c23db153fbe4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing pages or other malicious content, leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7dse1drn8nb6rlp04p9597q57r/fejafazexogabexepapa.pdf In PDF document text
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/26984131667.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zinozov.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/15903825256.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/6108628949.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/rabopunogukizijomevabif.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/32003265533.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d99415193---71760657967.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nbbp8qlpeqokk4vsr2rnbm5u22/fikesoxeru.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210904_071845.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/79881475215.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/381385381.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/96508669458.pdfIn PDF document text
    • http://hiniceshine.com/upload/lisix.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/demarususuroruxusikifev.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/41416878445.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882cc26869---botinamadenuxadopikimo.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/mipedofugamexopitusesoki.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/biragisivozigotovetax.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/40021822081.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/supinemoxoriwiju.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/vulavolojexuvezigudeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+calories+does+a+mcflurry+havePDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 17800 bytes
SHA-256: dc742a98c9e3e8335424a74e980ec422e0629d9b9b76a9e272d2c84505accea6
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 11000 bytes
SHA-256: 471be7a8cdeaec637611a96c91dfdccec8e602dab54e905af5d7bd8c77cb1f9b
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1