Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07b2ace3cb96abb…

MALICIOUS

PDF

94.0 KB Created: 2021-07-03 00:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdaec0cd66f078cac34c513691644567 SHA-1: 2aeb0fccffe865e7e2eee7ffe4e20be9ec05e287 SHA-256: d07b2ace3cb96abb65749295e51678842b159ce128717da1e67da87f95f8f247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across numerous distinct hosts, many of which appear to be compromised CMS uploads or on disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://labonguyenhoang.com/img-chamthi/files/nojul.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/69f8aa4679125e34a5a29dc64d90a88b/rowoxi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43fe2888f---vugifitenigowavew.pdf
    • https://hohsingfiber.com/ufiles/files/dilufumug.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1812b95---pikise.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/wuvevekuvowa.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/kir1stmgpkfgd0csgvff14fb2g/30713279509.pdf
    • http://premiercontractinginc.com/files/file/kepemosekozafuvowip.pdf
    • https://sasalidayanisma.org/uploads/file/rasuwiponovizubomekoda.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077564db69e1---damuvevivepasabe.pdf
    • http://zhengfutz.com/v15/Upload/file/2021620231391421.pdf
    • http://beerskiboot.com/img/upload/file/solob.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/81579213851.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/migosipirevaniv.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/14730156183.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5507e45e37081f9cbd9b840b2eee4ca8/42099647035.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/23675511191.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60f2505a9---jakatevoger.pdf
    • http://bakoca.hu/files/file/rukibufujafosuxofag.pdf
    • http://jncs.kr/page_data/file/20210624025311.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e14078f7---xobasejexef.pdf
    • http://okmarin.ru/userfiles/file/jenujutenavovimaxadipozo.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tn54etb6pkse93486bho8lutif/41153049912.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/81ggrk9ogrh2bd9r193gucl72p/49562840946.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0duf5j6d7lcluqvoh0jm6bqsu5/rewita.pdf
    • http://airconbank.com/upload/fckeditor/file/ridigirixikumabune.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9d76a2c37fc03471ddc17e9e6898c5e4/peramusuvajotutagu.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/f3f7fu8ibghq3ju0jebbmedl0u/vidubamedab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=introduction+to+the+calculus+of+variations+hans+sagan
    • 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_off0001078d.bin
3a7348acfb6966c9299b5e3b3d85c27199e90f5de3c274465f66f769aa279ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 18724 bytes
font_01_sfnt_off000138fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 16792 bytes
font_02_sfnt_off00015114.bin
6c31e316ee6c547bb0bf1874fe9c3d25e8b8199605fda755532303dbc4c7d2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 10872 bytes

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