Malicious PDF — malware analysis report

Static analysis result for SHA-256 1566f7d141721a8a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e645170f4c876c442c06bbd80d7b053f SHA-1: bd98c011abe26826105af2a3c768d5d838c8dd3f SHA-256: 1566f7d141721a8ac3410e1ae54366fbee14c7c718a3ac111a09e6cb6108aeb2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://jumpinfit.it/userfiles/files/jimigovexuvixikosag.pdf In PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/gexasimelulodik.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/kiwexevufisozilisipux.pdfIn PDF document text
    • http://aprt1day.ru/file/69695006511.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/zulepezawalixifixilufisa.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/nowom.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/58139735390.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/058e0e0f3a9a62e7625b3e4bd97351e9/waxovor.pdfIn PDF document text
    • http://szwygs.com/upload/40009048349.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/fibofasutimubojula.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210813182743_93w8bb.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c97489428---97174323157.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc1a72613---8342666221.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/16032799889.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/79067ceec495cf9b3c4af525c0fd4028/82190689424.pdfIn PDF document text
    • https://oliogalanis.com/file/lodejinexemun.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8b6ed77d28b58bbf02f70f252ca27636/59545677418.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o3r535iniv5c6om8m7olrkfvqi/tirigukulakez.pdfIn PDF document text
    • https://comiconfezioni.it/file/piledafeletakavi.pdfIn PDF document text
    • http://elm3rad.com/file/23395784646.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c99a8c9d1---93526052315.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/bafekomivafakixej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clock+face+telling+time+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 17428 bytes
SHA-256: c22a9c4326127052dd26f7d78b9dfd0844c59004e1e0141271d120b5e03eb8ec
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 10992 bytes
SHA-256: 3cd70f397a21e2ef59249e74c09ec747c62c56d29fbafd254fa959ff5ba49ba2
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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