Malicious PDF — malware analysis report

Static analysis result for SHA-256 1632b322d94275d4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 08:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59e7c7a0d7f7656360670e4a12dcadad SHA-1: 2b29a706c9b9964d169507ef1a00fbab46ca1ad6 SHA-256: 1632b322d94275d45f72a49326c54561bfaee119620d950315de877ec3e029ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised CMS upload directories, suggest a phishing or malware distribution scheme. The presence of a 'link farm' heuristic further supports the attack pattern of directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://queure.ru/uplcv?utm_term=recognised+official+languages+of+india PDF link annotation
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5bd4bd653---37658955564.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/jiluvaxoxomi.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/sukurepemezawox.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb67d745b---sikasitekomanujanonurukus.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef499a0735---lejimemurujanofe.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/81973828218.pdfIn PDF document text
    • http://budropol.de/Upload/file/taxikufaxawexagawuzegiga.pdfIn PDF document text
    • http://dasbluemchen.com/pijokugizonuwusofap.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/joteguxapajo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3f1a9ae83299772121cd3109be2fe9f7/xosalu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa434df9d---fepebax.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/70574844806.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/86026555474.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/genuxepuriruwi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nhosdruened72p53cdronajp5d/54598537371.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/nifobunoje.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vetefodivodiwinorexejem.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135d31ab4134---pagelizanasopowovadas.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/99775826005.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/11181610402.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/kokapatifiwusiw.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/90839348725.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/numalutame.pdfIn PDF document text
    • https://kultmotor.hu/images/files/80665311806.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/sepedobimupuf.pdfIn PDF document text
    • http://greenld.com/userfiles/70828747869.pdfIn PDF document text
    • 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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10596 bytes
SHA-256: 80407a63334f34adafa7d538c3b2dcdc857bd005cd47d4ad1d20893d5f0049df
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 17524 bytes
SHA-256: 660d5e0ff37a3867319f1ff1971ed897e0ff7386239a245f366020d7a3a0518e
font_02_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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