Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcce63148479722…

MALICIOUS

PDF

84.0 KB Created: 2021-08-01 09:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e2466d612b2d31e77f0f6e0635323b8 SHA-1: 463e058b2aabefda15ef91596520a268ce9f23c0 SHA-256: 1fcce63148479722a5f8e628c841e6ea7ceb413dfde4797ff3da6cd1ad0607de
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS upload storage. The document body was unreadable, but the presence of numerous URLs, many hosted on compromised WordPress sites, suggests a phishing or malware distribution scheme. The primary attack pattern involves luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://www.de.ruben.pl/ckfinder/userfiles/files/27974119058.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i1rel53nvm3cd63m7e0ncn029f/kubavikip.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8e397868---76590489850.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/potefus.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0464ee5129---romarixakevikorumamaz.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/4063726408.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/kinenujujojebujivinubag.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/95ef2aa6d2bd5bc74adaf5ec575e03aa/30770612671.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210623180629.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4f79e093---75965905597.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/31713140911.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021072606573573499.pdfIn PDF document text
    • https://ckmandarin.com/uploads/memazavodolifudebidiwewaf.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/82683850576.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nt9insjudfds0gmf85gabon3v6/nadefu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d39bf794---vefefuvudexesetiz.pdfIn PDF document text
    • https://ckmandarin.com/uploads/78784834493.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c35dc2b3fde---49645339559.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8c33782a14f919b6550d0aa93a79015e/vipuxujojebed.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/nekin.pdfIn PDF document text
    • http://innotack.com/userfiles/files/jidetipigikolesegap.pdfIn PDF document text
    • https://peterdegendt.be/file/jexorenukaroxeler.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/51041856707.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/41353133005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=employment+contract+renewal+letter+templatePDF 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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10456 bytes
SHA-256: f871d72c974ef2d33f5018b244104742c1c568212bbc3350ce282902f292e618
font_02_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 17496 bytes
SHA-256: 70aa6ea9fe1ea843e1bab74e490e4755e062d6f20af4f4ffdbe198f717138edf

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