Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b856c0fa92580be…

MALICIOUS

PDF

60.9 KB Created: 2021-09-05 18:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dadba3501ff7ce63065873bca42f89db SHA-1: 8a8033899a0f5f01d0eb994999a795d62c59b6ae SHA-256: 1b856c0fa92580be23bb4f3e61a483e371a8a683b1ca0e67fcd12fe3ceca00fe
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded links pointing to compromised websites. The ClamAV detection and ML classifier further support its malicious nature. The file likely aims to redirect users to malicious content hosted on compromised WordPress sites or other disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6527

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 60 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://zdrowejaja.com/Upload/file/74441083388.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e9b1aafab4c270e92b99f92710c98fe3/47985112271.pdfIn PDF document text
    • http://szpk.hu/_user/file/lapibasojerotilod.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/78507891318.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/7200017181.pdfIn PDF document text
    • https://citronel.com/userfiles/files/xeriwoweluzepamoremu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fofamupu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/95696285779.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/fefur.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec79dffgk5j8n400sbrtls2am7/redenazivemoxefebigibot.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/63562758810.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fce94a44---6770361604.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/ginedof.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00c055b6cd---pixeresotidijojixanujapa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9ff286171125d68134b8d0ed8bef1ad6/jenesixupiti.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/86292491474.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/71949135956.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gopufedodusofupirasuwo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/7453344631.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/bofefolix.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/suxidosagufeginemusesuzej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=configurational+isomers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 10972 bytes
SHA-256: dcc6de463bccbde2b86c75ce46dd9d72fe05606bde73bdbf691b209fd80f72cc