Malicious PDF — malware analysis report

Static analysis result for SHA-256 71168d7ea3d158a7…

MALICIOUS

PDF

88.1 KB Created: 2021-07-27 16:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6a14d20d1bf2339ae265fee73d73a6c8 SHA-1: 8ae8547167cfc60b41ab95363d281dbd2618c3a1 SHA-256: 71168d7ea3d158a7556337f8ef465d110ffbcf6e4cc2c08bbb26c119c8ceec38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://supermarketdv.ru/files/file/lugamaxuzixorux.pdf In PDF document text
    • https://mumegram.com/userfiles/file/pofijaj.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/febudavixadifon.pdfIn PDF document text
    • https://service-panev.com/userfiles/22710394037.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3e6c82be---fepujarefumikorefofurazew.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/41475117481.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/23263941794.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f18a547f8d723538afb518cd78f5fcc1/40807902538.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ranun.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/kovawigaxoxofivimekate.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jgfc4spe02b0cihpcist4tvidk/10124658840.pdfIn PDF document text
    • http://benetalent.com/upload/files/61621922068.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607040453b50c---89663895940.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/49545273756.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78347dd7d---58047146039.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/95739490537.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075234fc9fe1---25040814767.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8709ffbb14244851e0899e28c1741a1c/xulozujom.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/vapafe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7289b4bdd0ebe03b6a155a4d62ed8c3a/zifireje.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xitegadif.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fufve90gvo5fca9cp152ahscel/25312658219.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/dapujawagevi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/19119520621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+twilight+saga+the+official+illustrated+guide+bookPDF 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_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 17320 bytes
SHA-256: 1f7dfa5fab482a72b00c72bedce74b21f93e4d1fbfc5af9a85ff6c91a22e8949
font_01_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 11032 bytes
SHA-256: b0f5828a4bfebc4111e737419af01ebe52e92c137b72cf8a3b6fee42f877abf9
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1