Malicious PDF — malware analysis report

Static analysis result for SHA-256 20733774a596de15…

MALICIOUS

PDF

156.1 KB Created: 2021-07-16 10:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03bf0efe3a19469805bf4121e4664a1c SHA-1: a2f3df89d004d10a8a3027d51ca177e5f42c8946 SHA-256: 20733774a596de15a3e88f3e6f63533ff39f8d48198c18534737697f6de111c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous extracted URLs point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The file's structure and content suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee83d902a7---19879496854.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mk4n0jha9uoh5ime6mobb3spig/zukujisivezupunaderiri.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1860c03bc9d59ca1c23f3d9ea42ec95c/79754045652.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/bozunot.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/89040063083.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/muwed.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da11e7fa99---59754334516.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/51760030346.pdfIn PDF document text
    • https://datawire.gr/files/files/debanefoxikon.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802a4cb43d---tujixibopoximutedurapewav.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/pewenonalogakojiburifixe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l95pp0fv9j4ml1jk7tlhuusbjd/betabidofo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dqd17ual787b3fhst3qf8smuhi/nemepupokexasevojixava.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dd16b0ac8589860708ce92c2518ba0fb/legezudu.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/rojijinapalaju.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33c7e537d---68612204166.pdfIn PDF document text
    • https://atl-50.com/files/file/zubogum.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed364de147---26816822783.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e0d98a5f---zunosorijoxebur.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3e96fc3e---50615306787.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/166e6cdd093bef4b28eead387f933024/2949166446.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b844ddfc52f2cb843fcf3a10605360bd/gezunuzafurupufirabif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=colorimeter+mcq+with+answersPDF 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_off000200b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200B3 10756 bytes
SHA-256: 4edb5ee164ff6ff46cc18425b6e8a79a2b91ab83ad67896d1b87c84d654e7d9e
font_01_sfnt_off00021956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21956 18568 bytes
SHA-256: b92dedc29573ece206d9f9dd917f07bae8bf3faffb960593458337187780f45b
font_02_sfnt_off00024aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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