Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9d52bf80480ebc…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 09:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f29943e6958f04e04493658097b98642 SHA-1: 82db3261e08cc5e0995b79d49f100a94c2098cc9 SHA-256: 3c9d52bf80480ebc7bcf953f166184156b892e4a4ca1f62e8c770b7bcbbfd586
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://immobilier-valence-agen.com/userfiles/file/33074024467.pdf In PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/siwotodax.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210914_9247A70E43881139.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/madino.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161410db30fe79---44991504496.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/90777549475.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/gefalunoz.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d8e57632103720922cb132720ef8e245/32610092336.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/68007693514.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/63284695332.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372d24cdfef---felubakojusilo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/xigikuwew.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc76d60bb5---66357155158.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/sezodu.pdfIn PDF document text
    • https://svltv.in/userfiles/files/rowifazo.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/53329182013.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135178151993---66946828829.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109050524039933.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/6043504188.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tofuj.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/22664441936.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/83934638404.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906143221.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/47674657771.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904052435.pdfIn PDF document text
    • http://erex.hu/upload/file/83687013435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+watch+online+freePDF 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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 19220 bytes
SHA-256: 4138d56b86f456104e800edc7f9dfd3815dd6849a462e0c9ba9a8563c3a1adaa
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10972 bytes
SHA-256: ac5d21a38ece5b1e6e9e7d4f4587da318715fe86829d4dce38f3be84a83465eb
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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