Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18ad725a5bfe138…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 13:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39594e0dc71ad1c2991377a45e119410 SHA-1: c62b18ceb5bc25332f407be3aa87949fabc0e968 SHA-256: b18ad725a5bfe1386f90b0ce625aab6426a87feaf83c03526c1edebe1117b7a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, presenting an image to the user while hiding clickable links. Numerous URLs embedded within the document, many hosted on compromised or disposable domains, suggest an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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 68 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
  • 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://afayl.com/userfiles/file/12460960061.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb063b95f---ditutamoguvoxog.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/pidepoxivosoguzelepebet.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/7295428596.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/14861876472.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/botagejazukujip.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5431e1294d4e9cf7481135bae04ef1e/6105285324.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/79526894697.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/budogalinupubam.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8f822fe50a1de121314910953e688cc2/88711492459.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/vexuvipefaguvage.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujudokuveterixajixu.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vopunexabuxuv.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/dadalafovexal.pdfIn PDF document text
    • http://fxlcd.com/upload/file/63562424226.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/26370762757.pdfIn PDF document text
    • http://egitara.com/upfiles/files/1851502880.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491288d0166---82713047319.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/tuxofemipapiwizip.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/najisefasiwe.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/femut.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/24323872253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bus+driver+android+gamePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc08ac922---74752271485.pdfIn PDF document text
    • 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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 14308 bytes
SHA-256: 284f71988914b7d9731bb438842d26b8b4035d44aabfd2a6df05cc6d7c80dfcd
font_01_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 10664 bytes
SHA-256: 1f17fe4eb123706d98a9b912ec76d881b577b08ca23274f87b26433b4fe20f1a