Malicious PDF — malware analysis report

Static analysis result for SHA-256 492e497c70eb745b…

MALICIOUS

PDF

107.4 KB Created: 2021-07-22 17:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 605a90367fed608e43a43c7fbc8882bd SHA-1: d1dff36e5841bcc9c01cd6da403ef2e7ee8b32c2 SHA-256: 492e497c70eb745b5681267045d0af4a3edb217df9cbe172904768d54bb04c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://z500.si/files/xawosavukupotudefosol.pdf In PDF document text
    • http://washchienluoc.com/upload/file/jowatanaf.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/458dfc5cdf15efeafa62d1977ce9b18c/3330452561.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/wazetuterezevutenav.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/96265387204.pdfIn PDF document text
    • https://isosklo.cz/uploads/61761466688.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zomasozajevixilezomiri.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0ba0dc81a8869c2b361bd02fad359272/pepefutotita.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/45988957064.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/81b47221dacee887152e8902f0bfcf55/74723452581.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/828631aea377a4450effba48ee0241e8/4164611406.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/97593389990.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/e1ut6onkfss30ka6i9n3n20a35/wujapimavobibudatasega.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/98550095140.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a89fd535b96---satotezinafevujepa.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/30245411226.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/99e2aa70dfc144e41499b429c266617c/laledez.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/pulonasak.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c35ae5e508c---nalive.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160753e0b7773c---41474228415.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/xinadugiwukidu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/bukofubobejubexelanu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/27817117889.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6dd4742ff6d4e654de05457cec15506b/746198493.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1a6183d90120b895758717a18722c72f/zifepefojawisawusilem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=another+word+for+inscrutablePDF 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_off00013e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15629 10880 bytes
SHA-256: 4029fee0001eeaf621ed7490bd8206f8b96d7b430211294d46ba16037e54bcc0
font_02_sfnt_off00016f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F58 18384 bytes
SHA-256: 59e4c87cdcbcf7114a0c793c99c215b2c2557eeef9f7daffface0dfc5106eb65