Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c31285d4b23e65…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 23:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d1f7ceb555a6146c8bb29487be526f4 SHA-1: 675726b32fcbc4d492cf3ff0eeb0239322d9ead4 SHA-256: 42c31285d4b23e652b56084b551d47de4c7a256ebd2410cf343e9966fe690848
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript and external links strongly indicates an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=split+pdf+file+into+different+pages PDF link annotation
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/563ce2e8f059ed424c120572a467edfc/82567455440.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba53e68af9---xuwefelajutaduzugomuve.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/52116746510.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/82b7d6e17dbe823321af6c83d1dc2fdf/turijafofefuzelebemolofo.pdfIn PDF document text
    • https://tavio.ru/files/file/49499735433.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/852e52ed8318d8f6551ea2f7f64fa585/40485669210.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/desesobudib.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aeqrnfjmceav8hh8fo43k3e19/fiwodatogekijoxefefe.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8b9520b4---zuketulo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/upoel1qe9b0qqltgurlvh38j5j/nolaguniritolunaw.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nbjtidigms541jn06jaabog5s0/19570860080.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/2050263174.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/mipotenuvu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9bc7b91cf282d5403a0cb46ac70714f5/85295471128.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/84548748019.pdfIn PDF document text
    • https://renetravel.ro/images/files/41573884172.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/sewasavagazopobeliliraki.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/68c45fe03ecd886947b08c0163cc280f/rufamometadig.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/34829270694.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/201137296611.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/pavexovawalosu.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/rimuvobik.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/wobuwaxoj.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/21917946812.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/55222829033.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 18040 bytes
SHA-256: daf54127350640d2d6672c2d0966759783bd2601a8f00a72a21c60b33d29e047
font_01_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 10748 bytes
SHA-256: d0b945f029ea1beef05cbbd2cec4dd2acd0e29ffe34c35a35d65a8e307746674
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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