Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a664b105bafb82…

MALICIOUS

PDF

93.0 KB Created: 2021-09-08 17:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 961e113386188d80a16e097d167ea21e SHA-1: f90fed8c4942eec575ba8b724fe870f2358e2a5f SHA-256: 22a664b105bafb8267a133ea1fe9bac3b0f2dd893e492a28d3c9351d0c41082d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://wastran.ru/uplcv?utm_term=dell+xps+15+9530+service+manual PDF link annotation
    • https://5udua.com/contents/files/7979327585.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210901_E083EE07DEA44C83.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vunalopamewu.pdfIn PDF document text
    • http://tsydesign.com/userfiles/jws/files/gefoviluvaxoguzaledegu.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/75255841803.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2a95a79afa96d6c62a956c58178f3906/bibezuxusakogoja.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/woxasi.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/davoka.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zoximesur.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339f297e517---laxabelife.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/banisaripevawatusekakowat.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/duzunomofu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/funikukeporevarukidawu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/akj3h4rd4tqpr9qh8trjf3usl0/24078539995.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/23289537644.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/jelasobujezujenekugobil.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6cfbe3be---nezalit.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613801604b491---lenavopuwaduxixunolil.pdfIn PDF document text
    • http://bluebossa.pl/files/file/kixetofodatiti.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/6576504474.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/damaxi.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/74885432678.pdfIn PDF document text
    • http://rsentco.com/upload/file/19026278504.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27061332945.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/63081630795.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_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 11232 bytes
SHA-256: f217a2269c23b9eee1b513ed15c173a8d00e15e2371e31075fa4085167bae0ae
font_02_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 18800 bytes
SHA-256: 34781750ce55b1a080b5c9dcd4714b916a7f908413b3670359b045344f4f2ea7