Malicious PDF — malware analysis report

Static analysis result for SHA-256 e623192271276269…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 23:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52374c027b75d01d1661ee21ce5cd6b1 SHA-1: a8b3b408af9dc87dee98dbe8aefabac33a391abe SHA-256: e623192271276269b27e4ca2ae1d33c89a7c647e4b7f9459c1e6d8c454ccfd86
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the structure and embedded URLs suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://movitecnic.fr/ressource/site-image/files/kemimonu.pdf In PDF document text
    • https://iwnta.com/userfiles/file/ganubiri.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c133c36760077c483475f869b40bc531/penopixidasapixudebop.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/47747936335.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7c8bbeacf8d1b237531cf9d2bba90c98/44548178518.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dfede71c3---62543592376.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/66737572429.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4e4570c3---92316600685.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/setelatawojolukadebopa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0095e88a246081d2f660adf312a2b1dc/89931978921.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/gebefivuwejijutum.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/ganotonujewe.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/jazosekuwefamibiluwafejus.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/314790245.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4b061b0d38ed3049060ff8de084a5ac7/57041666383.pdfIn PDF document text
    • https://ijp2.com/contents/files/84724141920.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dedixal.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b359e2b69e42ff6b37a502586278e4d0/xafusajimebagazowosawo.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/baseruvur.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d3b2f7822d4d30c52b0f405edf29b97/benizox.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/87ba1b8bde0554fdd4137e838ef61e48/1293161958.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b6114276---86164194090.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3297c80b552f3b1557a54fbd13aec771/bijojoro.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/09f0c1b423ec3610cd2f41a21a20f697/tumimalid.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3fdef367752cd52f4bb035398a978e09/96107285862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=genetics+vocabulary+crossword+puzzle+pdfPDF 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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 17152 bytes
SHA-256: da5fc82ffd278cb72206b8792978d82fb7dcec1639954097f3654444ad651052
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 11220 bytes
SHA-256: 85ef8f73a567712d9615fd7f2dfb351c130f78c4ed1e21d36b8ee531c5052477