Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ff9f03c82ce234…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 07:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20aec4f33ed791fd79beef6eaf151c81 SHA-1: 383a408809cb4adf9579aed1cd810da4c4aa37a9 SHA-256: a7ff9f03c82ce234c64639e792476d032b6391bfae41633b256fda63bea5cda5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URIs, including one pointing to a raw IP address, further supports this. No scripts were extracted, but the overall structure and heuristic firings point towards a document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://mispuntossaga.com/campannas/file/12281592768.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc52d18df9---rovofesukis.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073563166bee---rimoxuxopexepisuraguvo.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/sipojapoxawelowerero.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/jixajomat.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/76213815167.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/tejopusipakol.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e4866816---64579047615.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/nepakapuv.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/38596877646.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/raposularewek.pdfIn PDF document text
    • http://toonesk.com/upload/34451342125.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bf9fab8413e6422adf906bdf00f8fc4c/gotinakufimo.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6c6jr019v8geot3drkie567m5/16013986242.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/508623761.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c5b45ce92f43156832ddaa3dcd813355/falikowimugejiwizuf.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210721024949.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/35201413187.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0adbf3b57---88244254996.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c347055---vozomoxesuf.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/legaremikenebavugamebakol.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/liresedamepilov.pdfPDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48551506bd---33894107472.pdfIn PDF document text
    • http://kaies.cn/upfiles/210610170052373612umtez0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+discounted+payback+period+on+ba+ii+plusPDF 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_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 17888 bytes
SHA-256: 8b7bf54bbf8eca09a271a8629fad70a6471aaebc082172cdfdb52d94e5b8660c
font_02_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 11136 bytes
SHA-256: 28d91b0e05689ea198a2c2ad90e2440a5a679694e769790ce6806beedce61501

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