Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dd8e5ac453c90e…

MALICIOUS

PDF

88.8 KB Created: 2021-06-24 02:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a78534cbaf2cfd3cee2762bc0791663 SHA-1: d54e2960a48852db1a51d302fb7abb6e4cc265d2 SHA-256: 74dd8e5ac453c90e29be8a3165f6d0845016bcb56cd53da357612a663692bdd3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://synerhu.ru/uplcv?utm_term=tamil+serial+actress+latha PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4be2f701de---4601762360.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dutalevuvov.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/0hdn6g8tgouuteclbhj3a6ht0h/xutadolowuxiro.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab22467e9---jixazitawon.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ec6d5c81---jetozujeriwakuduzejeze.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c97edd460---marokekabutozowetuzanesu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/78151833718.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/13c76b7675c1ff66832c1f624a777899/nogosufi.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818479c66f---kevisoxed.pdfIn PDF document text
    • https://go2germany.ru/files/file/kalewegum.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49a8d1523---gitutogakatemape.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5527a8bae---romorewo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e91bc975ea---vojemonugaxagipej.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/79304853886.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd047ef12c---fixujadadiva.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ec7a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC7A 12468 bytes
SHA-256: aabcf5d60a8f10622bc917e9c3ff76e9f4ba8e2f142c0c905651944213c3eca1
font_00_sfnt_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 4988 bytes
SHA-256: 85b8dff6b50a1c3b15df9a53e62070c9a8aded5c8ac5f121f40992c9b1cbc97a
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 2560 bytes
SHA-256: 91483eb7fa48ca14e7c751773c4c8733e1b213e0315a62be6b36b664df31ecb9
font_03_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 11220 bytes
SHA-256: 3b7fa6ee7f9a62689183f34046cd375bef9dfc04069016d34d930255592bb7a6
font_04_sfnt_off00013db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB9 16320 bytes
SHA-256: 5eb43d7840b83ebcf5cb39f5d6acc36d74437c45f04b3c4b9a4d4a1fc570f50f

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