Malicious PDF — malware analysis report

Static analysis result for SHA-256 edff0f9c73451950…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 01:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdfaf9f00b06bf65ee21956db04ba069 SHA-1: 92979c4a9aeb451639ff50a031642f613b570c6c SHA-256: edff0f9c734519506474032c8d4919037cb701789aee6a3cb5a09d884f721526
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious PDFs. The presence of external URIs and link farms suggests an attempt to lead users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/26337649518.pdf In PDF document text
    • https://matfreklam.com/calisma2/files/uploads/korutusudijaxepuzokazuwux.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/wizizuletelolim.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/bolonidigu.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xalimomireku.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/68478043571.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/98915119386.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/3938914526.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/rajumazemowadosa.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906021002.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/75393561243.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274fda73f1---26630410216.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21033477264.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba76280b5---37611714709.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/koxuvoborudovek.pdfIn PDF document text
    • http://qdjshg.com/files/file/xaribojijowofeb.pdfIn PDF document text
    • http://halmar.info/userfiles/file/lunalutudagekotozesew.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/74811718663.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/69659319641.pdfIn PDF document text
    • https://t2sc.me/userfiles/28121915285.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7a695037---80227595764.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/7615914207.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/tekudusubijakitewetuxedix.pdfIn PDF document text
    • http://dgkno.cn/upload/rogukovabosokaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+file+encryption+appPDF 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_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 17276 bytes
SHA-256: 6bae08e8afd85aecd76f46c7715031ae50e8912ada455fcce7c05a71c6f7073d
font_01_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10540 bytes
SHA-256: 39103b9cc97c230b65fa286b782f74c59031b55cdcce72108481efe84a4e3b39
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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