Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728db025f843156…

MALICIOUS

PDF

91.4 KB Created: 2021-07-17 17:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0bb3cd9db08e16d561003c701e89024f SHA-1: eeaecd9f92ed932f6d97fe6b5913d612638ac93d SHA-256: a728db025f843156618bdab45f90c77a233237d0a27a50460d44ecb8d1a25fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to a large number of external URLs, many hosted on disposable or compromised domains. The embedded URLs and the document's structure strongly suggest an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://s8radziejowice-paszkow.pl/userfiles/file/joduda.pdf In PDF document text
    • http://duonglaohanoi.com/userfiles/file/1672892590.pdfIn PDF document text
    • https://actorconseil.com/files/file/nitodofozogoju.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/jizusefi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b7e5aa31acd9baa6d9efe5370f7b8da/87119981671.pdfIn PDF document text
    • http://kme-kme.cz/files/file/47124491824.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/77234139998.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a36ded57---pofesovavi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077520de4728---feligojafu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/37817aef4acba3902eedcc71aa51db8d/78529042903.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f4a1e47d500d2e21089e9db066be669f/memajazet.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/27926915066.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1c3144e3---5280256294.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/fuxapasotu.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210702184300.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/18619679160.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a86c863b---28245680692.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/j4ca80da064le6e7imipt8idt4/13941809736.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/22962404398.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/74sfhhpb8bssh8q6a4tvpdhjeb/mawugoterod.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jokotedimexoralix.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd9d77698---69706739085.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dn45tip2j7o79hqnbg443uvlb0/kixikosasijumekunukaf.pdfIn PDF document text
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/65273706743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+widest+ship+in+the+worldPDF 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_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 18076 bytes
SHA-256: ae7373dee420ee5b66f8334ab9d2902469555bc14f3a8f93bd13c72cf23ee0fd
font_02_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 10376 bytes
SHA-256: 606d151f8127a785346215c9b7374552639aa9c5f99b12c300362fcef5a46659