Malicious PDF — malware analysis report

Static analysis result for SHA-256 856da804e1242607…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 18:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 700dac51326af870a58a774d657f6cf9 SHA-1: 9411e7845d1f80af3a0b78ff122589cb55481964 SHA-256: 856da804e1242607cae362add8da763975ffbf9c7933c37e639eb6e5d95591c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully detailed, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://hakanhurdacilik.com/userfiles/file/29871658559.pdf In PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/19039958062.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/98600815707.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/6675587781.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/dd547345e957d1aed97f8481b90e77c5/pobuzuvebezuwuwo.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xopemifowefuwukuvavitefuf.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kokomerevotalax.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/50048407993.pdfIn PDF document text
    • https://phukienbep.net/media/files/53366128598.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/galixufudosuk.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3e70484770239518258c62e39aaec43c/97880268896.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/18333019522.pdfIn PDF document text
    • http://robbes.nl/media/files/75979652682.pdfIn PDF document text
    • https://majubesar.info/contents/files/noligabafizesorek.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xelog.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/860bd55580bde8529aad89d93d9b94c9/gikitifixoxuxa.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/vazujogo.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/72080183212.pdfIn PDF document text
    • https://renault-service.com/userfiles/dajodarekejudoruniwono.pdfIn PDF document text
    • https://curvy.tw/upload/files/suvaxex.pdfIn PDF document text
    • https://iohrp.org/f_files/files/52083974419.pdfIn PDF document text
    • http://wami.cc/data/files/kapebom.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zavab.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/465024273.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/bapumavotafuzezem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cheat+engine+ninja+heroes+androidPDF 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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 10640 bytes
SHA-256: 98b8983b5eb4285bf101cfbb92bbcf373d567c1455fc87f05788f61b85f4468f
font_01_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 18952 bytes
SHA-256: dbc0b2039d18c34ef6e15d860ae24a703d52f69d7c0243ac56b73b1b6b8b2963
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1