Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1831d6f4198cfd1…

MALICIOUS

PDF

85.5 KB Created: 2021-08-14 07:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb52bbe029c4ec08d6ac8bfc81bc77ea SHA-1: e941a69a6743f94cfa03765987f214e483953084 SHA-256: f1831d6f4198cfd1401b1632ff88dcb96aa74fb0bcda9209c1c6c298b4c99a90
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, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to lure users to download further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://greece-ex.com/images/blog//file/20590750937.pdf In PDF document text
    • https://dpmceramiche.it/file/vavula.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/napetezalixezesim.pdfIn PDF document text
    • http://health-bridge.in/upload/file/kusitovisomatopazimogi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2493ca2c150103b4211dbd997d28ae29/97662315521.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/61480850974.pdfIn PDF document text
    • https://ka-base.no/images_content/file/linuwiwedunare.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/20767262735.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1300f84079d609590d180a3f88895896/jogamagerisarofumela.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fec62271d93274852bd99584d39577b0/96921557318.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/09f9e7636be6f03c4d38bd0b11dc9695/takebuxufazosujajik.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vusexe.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/17616153007.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c630a9a85c---birewatubaz.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/nuburudovojosilunegizo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f737bcea1f---392994066.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/dunija.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/4115658775.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/55378511408.pdfIn PDF document text
    • http://enricobarraco.com/files/62312690835.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a32147968---filoluritulasegopipedonex.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/didebaweladade.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/51269617197.pdfIn PDF document text
    • http://contextuae.com/resimler/files/25260913365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rod+weight+calculation+formula+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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 18736 bytes
SHA-256: cb8d8d05a2679d3c204014ca3afe3898e6492a8eb6ca37e5e87fa3f5e7c7491d
font_01_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 11132 bytes
SHA-256: 8761125e87997d52aa7ffdee42db41a8b393af9f1d3ba82ad21a49f4cc7f4d12
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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