Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c395a3e1c346ca6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 17:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16ef554995d745d2a063e42957722a5d SHA-1: d1c2747a7a41928300c0a755136b4604e08537f3 SHA-256: 1c395a3e1c346ca6e92298d8e03c8c930808b51b2e10f74efa255ad7bad1ed2a
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=is+until+a+conjunction PDF link annotation
    • http://grimastone.ru/files/vetaxa.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/davitapilufoji.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/59903173072.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/27923066171.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/lelipokikut.pdfIn PDF document text
    • http://levotst.com/uploads/files/4353036093.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/tuxisaboxidus.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/sufijunew.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109180452363954.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rabotemibip.pdfIn PDF document text
    • http://acelybio.com/upload/files/kobumuja.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfaf49689---foxesoxifinerowuk.pdfIn PDF document text
    • http://rnralpha.cz/res/file/60080437258.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/nijelekojasujidigekawiw.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/kixuteberapetuwiduna.pdfIn PDF document text
    • https://parkettworld.com/upload/files/guvawob.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f2fd1781---xebejofado.pdfPDF link annotation
    • https://bizimpin.com/calisma2/files/uploads/xojuravijapajadepawa.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/33011319651.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/77e67ab735d88f64519379b07cc625cd/xumufiwilupemuzez.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161361724b2265---20535619638.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404db5bb739---9640190742.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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 18788 bytes
SHA-256: e3ea9e596a0fd122e75f1d0ca149946e7afc1c21e8beab63e6e134f8533e64ce
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 10172 bytes
SHA-256: 5d373daab80e15f821cbc474091ba754f96206559721f24173b7e0b0614196d2
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1