Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19c6dadef31ecb6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 00:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 438e92128a41bd35890d971312ba96a6 SHA-1: bd52c201681aa2ec9fe9cec25f1842c8cb5476fc SHA-256: e19c6dadef31ecb621cbffb52f17924e02a929027eae8359f80e990f2c82c0cc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including one with a 'how to hack' query parameter, suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+hack+insta+acc PDF link annotation
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916050038538441.pdfIn PDF document text
    • https://izometal.net/mm/file/30646213372.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/geser.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/padoxebezetad.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/35920504415.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614264e68c8f5---86484399360.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/11951802022.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/67222139709.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/numowijoferetaza.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gijotisol.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47641d2f0---82003054202.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/ralasexebifawuwilikesegu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa57e368ac---lonubizado.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/13621101989.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/3967772027.pdfIn PDF document text
    • http://netflor.pl/upload/File/97018996451.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/potasatanesusi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161406ffeacc7b---wexamosup.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/62746806382.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/68464537116.pdfIn PDF document text
    • http://rjt1.org/upload/files/fudelakezul.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mevomejuvufevewijerab.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/sirozurukawezebodokilij.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/31414233399.pdfIn PDF document text
    • http://bankerz.in/qpic/files/lowunoladomefagupifaluda.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 17304 bytes
SHA-256: 03f0b72599e6231ec32bdb547d041dce4ed2c8ec8d6964ee99b840238fb0d0da
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 10216 bytes
SHA-256: 33c4030efda5515b896f0d759ccd61f9844f3869ed03b5e579f00283c77ad27b
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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