Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a56434d6ca524f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 01:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 546ee9305e4657b4a3d75dc9f5b25be9 SHA-1: 042ab2118628ca5bfc1cb15801da0902235030f7 SHA-256: f7a56434d6ca524f2632675725f1eef23f851457e9e90e5c0478165a9217ef7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kingcarmotorista.net/uploads/files/12529146684.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/givinafis.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nitavuli.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210912190514.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/4882248963.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/70733365235.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/joxevaxalezenewoxobakef.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/tekitujijegudaduji.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bd61b3438bb8c14b62c3cd9ae60681e9/60150133815.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/63170596423.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/likurozokepi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417265ee269---17129690897.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090318135869.pdfIn PDF document text
    • http://didula.com/img/file/99395812294.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6522a585e248848c44779765699d67e2/54386407766.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/vobosogijumupadavomum.pdfIn PDF document text
    • http://erimti.com/userfiles/file/73490504386.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/56923914683.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/92478934103.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/fimim.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/39006871965.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/55495240535.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/30245206346.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/74679645810.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/74331785955.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8d656f49cf3f8d4b256a7566f7995ad/dalavisanasawabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=allwinner+h6+firmware+android+10PDF 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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 10764 bytes
SHA-256: bd0a9ea0091d1b36a37b32b4529f34fe6c23a1017ce7693fe325da782ae67c03
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 19268 bytes
SHA-256: fd773ef5c8f381b728dceed38520d424cd8f4bd0e8c3bb029251f5b00024154e
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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