Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6aa90dc48829fa…

MALICIOUS

PDF

86.1 KB Created: 2021-10-04 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d06481f3b69f8be0cd32c4684af18a71 SHA-1: 74f86202b51d88ff80e28b6cdc8a0ed31cd084c8 SHA-256: af6aa90dc48829fa17366056566128ae306097b5adc58b94d0af21807933d04d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The presence of embedded JavaScript, flagged by PDF_JS, suggests potential malicious scripting capabilities within the PDF. ClamAV also detected this file as Pdf.Phishing.Trojan, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dataction.org/demo/dataction/media/sazojugojuketugibug.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/zoxofokexikaga.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/ninonefodabesemeterugut.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/refemuf.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/karubekobixif.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/xokoxijusugizufizalo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8226fa9e---jixuzaroxirubo.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/33277384651.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sajedijeba.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/48676251007.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/lufalazojejubenefusamebi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/dowuvotoruwevep.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131341d4ba72---biruzuwizenexuna.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/97991343707.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/33583803391.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/xififexumoforaramugitu.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/bavir.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/58618680615.pdfIn PDF document text
    • https://la-klamm.org/Files/files/tulukojonunizivegoloral.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ag8gl54eq77fmive3197rlqovk/7581231552.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/fewoxelifajavebopukiwopop.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/penetefapozasuwomalone.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ff5aa68cb84e8983e4f23d9bc1b1cb5e/43186679106.pdfIn PDF document text
    • https://tdfstore.it/file/92724368486.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/55840440059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=aws+placement+groupPDF 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 10792 bytes
SHA-256: 22987d4767acb6c6888ee141ebca299e0b576ed617a087a0bdbe59428b468435
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 18724 bytes
SHA-256: aebaac167833b6a4426a99d717d0c9c88ddae97ed63a4b26240597581538c1a2