Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bc7c58df1949c1…

MALICIOUS

PDF

94.1 KB Created: 2021-07-13 21:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49f150d2ff0f462361f969bace0fd2f2 SHA-1: 4aa68eeaae29e578dc9dfc8a0ff0cf8f795cc1cd SHA-256: 71bc7c58df1949c1b97b27d380efb717f0b2626baeb5cccd9597f24ea0dea513
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious with high confidence. These findings suggest the document is a link farm designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crysiq.ru/uplcv?utm_term=chicory+for+hair PDF link annotation
    • http://laros.cz/UserFiles/file/23075246924.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe94918fd---nemuw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed576ae706a---88876450502.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rupenubagotikajonobumul.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gebaweleda.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07740b169---52722627312.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/67fbe80084b86ca4f2b312d712cced12/puxonotixabolup.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e257999c75---33960162659.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4jq51i8tu32g974ui33nt6l3h6/55416913767.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/96599253231.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/79544315808.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sutetazawezolesafud.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9f0efa1b2ad29ef2c7e41e3212ad0661/74127356380.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03c35b8e5---koputuxiraxidapawutar.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ea9e4ce8q14p7lbue2aj3rtt5f/49468106223.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/kokewufeputarodu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/pokiwerabufe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28634d7be---41023685502.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/tusadugafinosok.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fbb7096d8---39618973806.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/sijaxawidi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608414c2caaba---fezekureboboduvejafaludu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983ce31f51---kudedu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/134a825d582e137e6b42e35f884a50ed/galokukorivuwuxib.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_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 10028 bytes
SHA-256: 6acf99e41cb9d7206f08d3cd74d33060a838f37a4952925f96984d2ce95a8e42
font_01_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 17544 bytes
SHA-256: 749178407796d9cf6e3b39304df8bcc344d32649838e1393eef76aedc303d797
font_02_sfnt_off00015360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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