Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dfa76c08b40f21…

MALICIOUS

PDF

67.9 KB Created: 2021-09-01 02:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3d83ec3d4dd8697254d5cb87738f59c SHA-1: 64a6c5bafecf569862b66a4ae233fc1177eecd80 SHA-256: 11dfa76c08b40f21f376fef54a1009219897b26cbf2629284633c414ed42e8ed
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The malformed stream length heuristic suggests an attempt to hide malicious content or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gzmzwl.com/Uploadfiles/files/13637367825.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000e6b58f5b---musotumakis.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///19139463430.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/tinojuf.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/49707951528.pdfIn PDF document text
    • http://ymmicro.com/files/files/42972344652.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/64836060869.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920c77032a---6540289399.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ca026d43---tesuzulem.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6579a97b016f192f4c2964748482995/70043792849.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f693d84c10---todajanapepogoxusenod.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/xefekesufuvirifuki.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/28736587744.pdfIn PDF document text
    • http://shophouse.info/images/files/3443401050.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/netixuda.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160db407e8c2fd---bobukuraziluravibojogemol.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/63654203791.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/37231426780.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/32670344318.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087214185ce1---63508850857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adrenergic+synapses+release+the+neurotransmitterPDF 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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 11156 bytes
SHA-256: da5750abe376272aaff214a4ea2262f8ae5890d3a758424854350358b099756d
font_01_sfnt_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 13672 bytes
SHA-256: b2b9491b231f0855f3ac8ff3fa77298544c31b1f55b4ddb59ddc2e7aca4e9e7d

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