Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ab3cdf081f2264…

MALICIOUS

PDF

87.8 KB Created: 2021-09-23 21:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4197c05e461306957e09d6197c9840b1 SHA-1: 469905c2691a8c56fdbcb76b4d9022884ec79582 SHA-256: d2ab3cdf081f226460afa1e2868c5c8bda6d5e1ef97521e6d8152f8a6d0ec7c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lammermoor.net/imagenes/file/56646591721.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/89988778629.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d77d38a---fefifafi.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/tuwoxenikimazigo.pdf
    • http://karlsbach.de/userfiles/files/54922979878.pdf
    • http://angerdress.store/ckfinder/userfiles/files/mifolub.pdf
    • http://elma-itc.ru/!upload/files/tijavokusorejukutow.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/4243778994.pdf
    • http://saconsultancy.com/userfiles/file/19135508268.pdf
    • http://kechengchem.com/upload/files/28929118181.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-12/20210912124334594042.pdf
    • http://hanleyresources.com/images/77735480612.pdf
    • http://ugrctrani.it/userfiles/files/tobapo.pdf
    • http://findacommodity.com/upload/file/58022363608.pdf
    • http://sahamit.net/userfiles/file/33517488033.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/91580804384.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/sarizo.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614c661401393---kebojisikafawiva.pdf
    • http://tnhmc.com/userfiles/file/finikefosefaru.pdf
    • https://dom4m.com/userfiles/files/58015902003.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614677d462f10---polaje.pdf
    • http://philipp-haberland.de/images/upload/file/vevigevadij.pdf
    • http://club-integra.ru/userfiles/file/77060441065.pdf
    • http://vidol.eu/userfiles/file/65662964497.pdf
    • http://5lovestartw.com/CKEdit/upload/files/zebogorat.pdf
    • http://kramnyca.info/img/upload/editor/file/68952537568.pdf
    • https://latrinquette.com/upload/editor/file/fopuginenapori.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iphone+11+lowest+price+in+which+country
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 16792 bytes
font_01_sfnt_off00010aba.bin
077dd8fa05a1f3f37b16e01fec7db13b3f93a125bda9c0275281531be9ca3018
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 17788 bytes
font_02_sfnt_off000138ea.bin
d54713d96abe97757789f81e4bc59873d205cdb1e53bb85d148f652eeb2f252d
pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 10612 bytes