Malicious PDF — malware analysis report

Static analysis result for SHA-256 3627977d52313b71…

MALICIOUS

PDF

99.8 KB Created: 2021-07-21 02:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e376e785ddac4cafc4420fa41b504464 SHA-1: d74e01cd1e58373a3cdff0146a2ecbc431227014 SHA-256: 3627977d52313b71fe8d655f4672e3d7604049ec49d7185ccd16995c9695e54d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use link farms for SEO manipulation. ClamAV and ML classifiers indicate malicious intent, specifically classifying it as a phishing trojan. The embedded links likely serve to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://amd-export.com/site/upload/file/5399698430.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xuxek.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b24005e7a31---degipokokiwaxajepol.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/12501179493.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8444a6b55a99340fd7fdf71e37415c1e/nifufuvabujefodesitizi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/voxajibotumiwanipowudi.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/94773821385.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/52242596fe7d290db124d6984bb49ebf/rakugoweluvat.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/25cfa52312a79c2efb11e91d21a13ad0/takevadepuxomesujapib.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/93cbd23d38bcceb5015a54a27d5704ae/75007424730.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079803729ce0---kodagadoninakepiduwen.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc0592dec---tubuwikopopeledu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c0f2a524---vojini.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c140ec2a8---jefobukujavazixefev.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/89697448692.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/91262719760.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/wodug.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/63825169775.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/85851584295.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8217ac9ae14aba3a39fe737c2d45d36e/64020039416.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l6hht1auoh1ohkk09ose552v71/76040383012.pdfIn PDF document text
    • https://ubranni.com/uploader/files/mosisejukokij.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/katuvigowaladudotejise.pdfIn PDF document text
    • https://isleo.com/i_photos/file/50822173384.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/93419394305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pine+barrens+forestPDF 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_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 17620 bytes
SHA-256: 190c98e4c082b12f1322454549b72956aac03d54e8f6ecd1ce6f58062b0ee456
font_01_sfnt_off00015406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15406 10300 bytes
SHA-256: 767a659f1eb5ca182669b70d50502cf06abbd075147ff795652c4f0cdf762f6d
font_02_sfnt_off00016b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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