Malicious PDF — malware analysis report

Static analysis result for SHA-256 4324aa336b2a878b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 16:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0048eaed7f3cabab1de1b3791232c8c5 SHA-1: e1dd975c2c18d27142df1f5f9c1fba4767f4ea91 SHA-256: 4324aa336b2a878b26a69dedcc32269e24bb5c98b16e0e3ab73776a714ead684
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to websites that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of numerous external URIs and link farm indicators strongly suggests an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=opencv+3.4+tutorial+pdf PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ju0ugfaaj0830ddufs9svfk7e9/66539457175.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/79930391588.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/l91msg1q9hc38du7r144p59u85/25477973177.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/5813272577.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/kekufe.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/burmd0roglq6am4dijjs7nio4u/59579284943.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/32152528449.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sarubuxelavisof.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7c0ce4465a1302e48ccef7f4938ac17c/bekerowebiri.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/81072489622.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/15991779278.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/94057e725b27b3ce0adbf12db435cb3d/62947443394.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/74248263783.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ace1fe89---luvixawagelet.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/49161665242.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/fosunawetetover.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/73233288962.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/78135731591.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6af4592702---90644637755.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612db4f15d6ca---dogegizifizuxogixe.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/mufuxaxiduwi.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/53373332075.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/nukovewomowuvar.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fffcedef777---60474344293.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 10952 bytes
SHA-256: 1bce78a56087234770eb78036ae11af00d9fb14dbc2725f406c8dd501171274e
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 17320 bytes
SHA-256: fbe0654792da933590913bbe61828ca96563b5b1341722c32c23a1649726afcf

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