Malicious PDF — malware analysis report

Static analysis result for SHA-256 9542bb6209379fcf…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 08:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 003156255c0c9a9d2e9a5994b8e1bb04 SHA-1: 0d43e9921a8ac874db17271e19e52c6030f080f4 SHA-256: 9542bb6209379fcf47f3161c84f0ca0c9ec5f20dbb2eda471a3782c9f645d44c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and numerous external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://smidgel.ru/uplcv?utm_term=ios+status+bar+for+android+apk+download PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e3a2395---jujukomisegiwolemigim.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9165f98b---71756900439.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/59160975201.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/67444927120.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/kekived.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9270a5480cf5e7c3d8ce9f0a913e0399/kazenowozokodaratufupixa.pdfIn PDF document text
    • https://bagstyle.uz/images/file/xapebajawawupilaronevel.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/34624785543.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/dokuvoxub.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911080817.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/81011118366.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109072044573595.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/lomuvit.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/33163307456.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/17130728372.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fazanisozotazidoja.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/2690784822.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/76637358336.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/bowofibakemewirogowebe.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/94694023971.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64510081482.pdfIn PDF document text
    • https://atrax.hr/files/givap.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuc1pskbnpp5igdmf9l8id3m5o/kawixukaxerovoreruvare.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/nisuzovunolibowawufar.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161395fce54194---58946883465.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dowizi.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_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10728 bytes
SHA-256: 7fd165a6241b19d0cdb8faa654601ada4893d51c53cce6af3e414efbb4a1ea28
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16168 bytes
SHA-256: deb4fa81c63cece9ff2f597f860f85115cc332a76dc8341d3b1d6d33cd26754a