Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e48385232ddabb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 00:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a191aaf14b091d8373fad5ed6aa6e35 SHA-1: c15a08a43a4ee09879b41e1eb2c251a8a772404c SHA-256: 88e48385232ddabb59d3be3ed4a206d246f9cf08463c4337f41b03e17a32b181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URL farm and the heuristic firings point towards a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=how+to+connect+mobile+with+normal+tv PDF link annotation
    • http://slovoveri.org/userfiles/novegojeniwerexox.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/pijojubulipekada.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121850505240.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/8334915368.pdfIn PDF document text
    • https://harmony.im/userfiles/file/xipapaxugikepawo.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/perilaz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ee975a16---97790814709.pdfIn PDF document text
    • http://195exim.com/datas/files/56228102252.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/82888829835.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/kalovamojolejaxubib.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45264d36---getomazus.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/26189245781.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc8f946d7---98024266899.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/97543723859.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/48717844562.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee71fba294---65218711864.pdfIn PDF document text
    • http://robedecreateur.com/img/files/rakozuvofo.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/mupifuzete.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosakikogekigeziwox.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/jusakerivulugunemeto.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/98946046101.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/64328888618.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17468 bytes
SHA-256: 7da48b6c7d5060cbafe20ec7d80c5bea7ca73f0ff45304a31890510a7a0d658b
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 10608 bytes
SHA-256: 5ad7afef4f2253b4a4887ba3f5722db79cc9a37d1d59e43befd41ad3fbc2ec1b