Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c578b6bcc3b27e…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 08:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d7a03093b017598eb704bd3a71baf7c SHA-1: 49d8ce24ab54af20025348a3134a360a2322232d SHA-256: a7c578b6bcc3b27eea81c1247d49772f18bc9b39b68ca5fdd72512ef669d03dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1335410f43---tibasarogasek.pdf In PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/jiwufamutol.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a828426c84a---wodosonasiwirorozofa.pdfIn PDF document text
    • https://susta.vn/userfiles/file/degixavaj.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/24769389619.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2cd750152---xokejesag.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7764992fc---malexizezezuniselelewow.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/gomifobupesefijamun.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/863344ff53387360dcba6b1bfb41305b/62392907994.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42038693016.pdfIn PDF document text
    • http://lemfhafamilylove.com/clients/a/ae/ae548a02e38cf20d1222216853584fb4/File/5799400551.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210826120325.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/20803133731.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/75a65fec3e4c4c2691a097e64127485d/62562753316.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19742b91d---70875326393.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1629581576.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/90416759290.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/kuvixekali.pdfIn PDF document text
    • https://ovalpolycoats.com/media/44773119348.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160983775d1ab3---zunepapomix.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bexiku.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/daxatozirebup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=telugu+riddles+with+answersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b0c25ede207b19046922b86e86a7966a/52664351511.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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 18192 bytes
SHA-256: 70b2d6739c64e69032db0ba5e0caf0ca7ba41a56309df33fa867fdd998f1fcc5
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F2 10556 bytes
SHA-256: c1cb1e837e28587e73e7e9b9ed648787fb2486a4562602e2f01e5ec74e1c4eb7