Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6e1dd5cf231ed8…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 09:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a960055fe985a378ba068caf5ccc1d1b SHA-1: f2aac01bb13ccaf1bc8fe55db0fa33fbbbf96eea SHA-256: 1f6e1dd5cf231ed8d97214b8dac5dc7fe0875a7d3797d3a54789333d33593667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting an attempt to lure users to external resources. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://cluboutletmoto.net/campannas/file/miwizifu.pdf In PDF document text
    • http://budaors.varosom.hu/userfiles/files/59292691087.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090706495751.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/36721692044.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/gomobonune.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53588510839.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/60435619467.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/sagesumo.pdfIn PDF document text
    • http://esistore.de/userfiles/file/josotavakalekik.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902205212041.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/92001113391.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/67815156654.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/2881394285.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/39640692506.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a41f392262725f057b9d7f862e48320a/duwozaju.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/43393139413.pdfIn PDF document text
    • http://machin.kr/userData/board/file/10151559956.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae8cbb0e3---59031806596.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/37727674023.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/sukudibor.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/53177989459.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mofavopuxufarev.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210910_142536_194.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/38477164157.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f52fb07b07d4006389e0833520789f8a/gugajutovoxuf.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/dadenodakosalitira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sms+app+f%C3%BCr+android+tabletPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16836 bytes
SHA-256: 211097b55cbf1985c25d6955e8b04dca157948ab56e2a5568b5bc4f37b63821b
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 11068 bytes
SHA-256: 122dddf290acead41145b4669e5fc1ca42f4ec72267cbcaa6d0e94a627bd1e2e
font_03_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 18372 bytes
SHA-256: a9361e9340890b7fdd587e2c6254e6c374faa2f70ecfe56ddc51ee63c855c2bc

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