Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b4762e7103d7f6…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 19:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d8cf6dd289201dfebe52f8bc54cc0811 SHA-1: d12e834c936183de6822906d99aba4fbb9994fc1 SHA-256: 23b4762e7103d7f60a55768ebd34aecbb92f5e6b6eb521a8363cb41793049c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://drafthe.ru/uplcv?utm_term=7500+zloty+to+eur PDF link annotation
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e97f3d8d434f14038b1ff24f3025787d/375986538.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/somipaw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s2gnn8p2gsfajv6mf32sempjp1/xisafumakatokoxilumef.pdfIn PDF document text
    • http://elskenecologie.nl/files/53026300622.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/146d7b0d8c308b29887b8e780f854850/soxiwagumexune.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1f61d1ebc9c453a6517b649fde4a4059/tuvutiwamovalatedetir.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160863fe082952---34206006340.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160db8ed5bbea3---28977390774.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ea2a119---52177906449.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6d5c54469d1614c5231d2d977ec8e17b/xabuvilowovijaranakoza.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/47c76c18145ed7ab9a3b7c7331fc9a23/dorusitivokugurage.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/aefc83fd95742affc402aa5a51d2a10a/37707547473.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_165501_191.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/jotogegokina.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfc9d0a0d---sinamijabuxir.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/95636e637c65848db92205141682e42a/xitovegifova.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/79449981536.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b423ea5232e8a734843853707f09c91c/tugunoxu.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/79790401831.pdfIn PDF document text
    • http://e-hane.com/files/puroz.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/38812174321.pdfIn PDF document text
    • http://meta-min.com/files/71437132820.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/74872006151.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/8627135492.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1804413d---zowub.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/womok.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 10056 bytes
SHA-256: 78fcb4e7f5cae693499ad06f983550daf912afb14733b2931e6b6c5506f664c7
font_01_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98
font_02_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 17208 bytes
SHA-256: 78edd7be3e1cc2476a35e4718596135aebc823e34f14ec0b4033d52973b0e144

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