Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffe29bbe422145d…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9216e8c14b807858c0ff8ff0aba29c0 SHA-1: 36e8dce975845cb673bcc01c7f58e20e2de5bbf7 SHA-256: 5ffe29bbe422145d0f95d0d3ea5804b5d772a98c04686f017791fdee8e873214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The file likely serves as a lure to redirect users to phishing sites or download further malware.

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://nomylo.ru/uplcv?utm_term=big+sms+apk PDF link annotation
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/milelalatokumu.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/87555845784.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2039bf04e31e93592f53c22ecdc93fbf/90962468190.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/juxilutisur.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/42730758125.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/89522323704.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/vovavotazanukukozo.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/32178925054.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/kotutegogefefagose.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef22646dfe7aae14d6e57dbcd740512e/68152816321.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/53398455610.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/87795786917.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/rotirarepotedidujiterike.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615174c9f0b65---nivizawuwejuvaxojo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/97434470129.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/53955182594.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/xawiw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hrnn019f616a44fokq2p08v48e/92639949077.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d9202b3d93f3a744e59e6d1e195f6af4/liredatuweguv.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/58329385890.pdfIn PDF document text
    • https://sentralperdana.com/file/97840882587.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/wotinukejavofi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/85290245322.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/30332189566.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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 17592 bytes
SHA-256: 94a02d1133ba3d1ac4c3284d3f5ab993f4b252979edff2ecc458a48dc9d56f37
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 10140 bytes
SHA-256: b170812a284cf17f8790aacb7658a15808d799ef5c1ab9f59d91d611bdcae327

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