Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2959abd50fc735…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 22:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78fb2b0280a3f366ca6e12f869bf3d17 SHA-1: 05fadb9f543cfafdc892a666508c282ad2ecc194 SHA-256: 0f2959abd50fc73540d02d6f2d08a38e40793b5b4180ca1583519133eaf81928
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crewmak.ru/uplcv?utm_term=manual+breast+pump+at+target PDF link annotation
    • http://esoftland.com/userfiles/file/45222426004.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9c2940b3b33dcb49f07fbb71d7536fcf/8966942194.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/23i1cj8uk5t4pm4ebe5t608201/98969026626.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/rapixefomewegesemuda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7b6e09ee---fadivibasuvuw.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/taxisavesur.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/fejipojijilusulusali.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf74a744e95cdd9e237cc60bccf6db24/3855768201.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/52526368862.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/wonajefunakavasugesuret.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210603204957689.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/68275162150.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/wusanixanununifapeg.pdfIn PDF document text
    • http://chpcentre.com/files/file/14408566164.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/kemaji.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/rozusumilirixetewes.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/jisovojajetuxapezorobovo.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/lewijejirudexiviwer.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/pijupofalopedukip.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e61bca323---45475250409.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bqbeaba9ur6m1a9de48gsgai2r/14995547681.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d1bca729d4c461cda13d5538fdd135c3/91339443175.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befaad0bb25---gamalitasepu.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/71794265367.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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 10616 bytes
SHA-256: 726e4b7b3042e91bc4cb0f598e740d9a52c735cf60f1e63881ac55039d02aa55
font_02_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 16856 bytes
SHA-256: b886e803ed0ade16ba04024d04792deacb3fee5ae508a02d8bdb3b53f0108865

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