Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b2d903b561852f…

MALICIOUS

PDF

90.0 KB Created: 2021-08-14 06:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6e8ffdef18da7680c276d1b910862bc6 SHA-1: 971d6ecad1fbacb1de19ba34926d62a97d14d571 SHA-256: 25b2d903b561852f34cb30165c308ef7fdcf694b6acfa2f11ccf3f518f3bc4b7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. No scripts were extracted, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alexanderjamesbackcatalogue.com/userfiles/file/82439810443.pdf In PDF document text
    • http://thedreams.cz/files/xugexum.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6700df510---zivujebajajipetetoxer.pdfIn PDF document text
    • http://hkacca.com/userfiles/tiwamefuxu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/zexij.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a8f4d7ddbb4500a465f1dfde50d0ee06/rupidumip.pdfIn PDF document text
    • https://majubesar.org/contents//files/31597290278.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/dakudovivudexubog.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/18462787584.pdfIn PDF document text
    • https://aashianarealty.com/file/60496443995.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/52d02b5fa120f752ababfcf26b7b942e/boduratanevezuvinesevov.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc3926fc8---makifumuvutuvujebimogimo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4cd4e3198---kotixe.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dilobe.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/79053091300.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/53654962153.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/ramezap.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/tokorobufozulinujotom.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4b30gv68917va45u4967c0k8dp/jibonig.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/0fa14b1dadd52bae3fe0c9942999cb73/sopawamubemobopabuso.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9prjdcmlh0n9di0j24dg867kbe/jetuverogivepegarikuruzi.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/56395435997.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j6jc9q7hb6m43rhcg2cr8mud1h/xoluwoziwenarojeweri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=analyze+the+circular+flow+model+of+economic+activity+with+government+influencePDF 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_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 11164 bytes
SHA-256: be364f24995251d4301e6be036ebd20a2a23541c0bd7fb43f727f4304363c143
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 17872 bytes
SHA-256: b1b79bf5017578721a14d796d72c7496943d610b70bfd71ca133a7767f7cb89e

Open this report in the interactive analyzer, or submit your own file for analysis.