Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3bfd133d0023db…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 209a118a7dd95c017ffacc95e6af4318 SHA-1: 588cb5749338fc2a477a3034e2d7c8a9a463a6d9 SHA-256: bc3bfd133d0023db5b46d34db79863a1e90fc7ff101719964c3b44fa811a3254
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=the+celestine+prophecy+pdf PDF link annotation
    • https://rgcsmt.org/ckfinder/userfiles/files/gapijavovomeva.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6i6jej5pc7b321i17v46gsc7or/tonikixinagutopepob.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/69943488233.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/gipelexopovowirasiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8e82eabe---solib.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gozejubezexuxubebodod.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/pukanidiladenodaruvewe.pdfIn PDF document text
    • http://agilesolutions.in/uploads/26556878113.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/072a560b5eca18d0dcdb800c4a4be1dd/fixaludasamub.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/ninikativatofetufonefuze.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lupawaxigipinur.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/65921991030.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vosoluvej.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/37418044250.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e01558c78232b3a91e6529459d12a7f4/mudizivasife.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/mekavegatapoladevagaran.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/tubanosekisigilejasawi.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/bumijaporixalebijalosemi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25769057436.pdfIn PDF document text
    • https://rintrans.com/files/ponire.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba11bfa98---raturuxatifuvikija.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d046d925b4a7a985586fefcde2671e41/xobekodumivumukijapu.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/80721893407.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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 10632 bytes
SHA-256: 177697fa73c8aca344c4e800d062d5647b646996f5aba2c36bab0c41548a4039
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 17968 bytes
SHA-256: 18bfd4310e1d23e0546dae7179949fea1764f3bdb89e72cf5e2413ba001b1e12