Malicious PDF — malware analysis report

Static analysis result for SHA-256 80532a9ee61fc157…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 03:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0fed1765ee732fe27ebe73fbc47b5c73 SHA-1: 246d1f1ee254384ed4feffa30165ff06ebab6a00 SHA-256: 80532a9ee61fc1570975092f90975ed338cd2da9b0894dab4048d39042e15aa4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or disposable, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ukmalayalamnews.com/userfiles/file/20012831702.pdf In PDF document text
    • http://billsky.ee/files/file/xufoxenewomekogejanelevat.pdfIn PDF document text
    • https://medtek.vn/storage/file/mevuzivojerazuxezazisib.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/35132575997.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/21409473751.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f593834---zekilamul.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/paremamedevilezosuja.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/fd43584de8da35ce115e53abab49263a/lowunirirunituna.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/39458366048.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/81134030816.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/fapije.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d67c423f16f32e7df0ee6136aa377f61/99595366728.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/rubixevuvipepojakubaveti.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160986674b3cb5---toxurutevakobod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3511b301---nekabonarun.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/devitod.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/2834016703.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c8e5d051ba5196a62ac5c5e90df611a4/64856906453.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7dabfa48e17865b00b87757ac3169c31/75622968039.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/44e769e43a5173cd5b7b091254c3f42b/xuposolumi.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/90205058451.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rivibinemigojidodofasibap.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210605_0E93C255AD3FCCDF.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jesiwisebakesosuf.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f5cae705---zidotadizokerasili.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052503465873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=boy+tied+up+tickledPDF 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_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16644 bytes
SHA-256: 9dbe2e435b08ed402a2c104d344b6922cfc981cdf2dcb62985fd6b77c7571cee
font_01_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 10332 bytes
SHA-256: 9bff141008500618b512dc07fef4c24afb4c70b9145162706be07641ed066c63
font_02_sfnt_off00013bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1