Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fba4b237b18c435…

MALICIOUS

PDF

92.3 KB Created: 2021-08-19 12:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f331c1f117a7766f92509b534117d0a SHA-1: d2a104e5ce3ea968a3de12253c376bd4cdfec7ae SHA-256: 1fba4b237b18c435f9b0fecf198dba23358a9bba2a9395f6377ad438f4127e59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://bbhshipyard.com/userfiles/file/sapite.pdf In PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/10601195951.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vobuwirom.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/38870729723.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/92543227688.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103db7adaa44---96449697495.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b4ed443c---10221520048.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/xufopa.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4c5a824d---46538383636.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/nesigi.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/42390323850.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c130ef9f255---41088340372.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794fe84f10d---19777821998.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/bufod.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/61701962190.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/90514152111.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/84221777554.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/kagugofogojatawolum.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zixezetilefigenufar.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/73137801697.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/43802189029.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/vagiwunixidej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+the+dropper+map+on+minecraft+xbox+onePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 11172 bytes
SHA-256: 4806f709633c2a915572375f02d7c3d4e7ef5a3116a53a90470bf8ed50798fca
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 17308 bytes
SHA-256: 75bfae2117de9e1f874a8104a2ea79caaec399db86ef8556a580c0b29fa1997e
font_02_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D0 16704 bytes
SHA-256: c5cbe5a2e1bb78ec4f9d26721b91b924239f21a4c38abeb1aa63745ef9504925

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