Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e8c0eec6daa315…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 01:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4907b15d852820b0ba3dcdf54fd525aa SHA-1: 34983fb69207f8f2331197a0cc2258ab4adabd08 SHA-256: e4e8c0eec6daa315ae7cfdb0f998b89b5ffd4ce05636715801718f4a14ea484d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=yealink+t48s+administrator+manual PDF link annotation
    • https://datajournonepal.org/files/lafepuxajolisovopudus.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/feparasulunomofusufe.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e729941c06---rinemogetiwoledoxibixa.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/zuveniwavofekikijogibuv.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/10252404924.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747c8b89741---75293800177.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/98928284732.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///86207425000.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3428473498.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/94048841523.pdfIn PDF document text
    • https://grancom.by/upload/docs/nuborogisuguvafaluris.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/59661083398.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/54975181963.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d3abdb8b---88816064152.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f23p8f3qqdmv8e3uf30ijpireu/11416795294.pdfIn PDF document text
    • https://ksboutlet.com/file/files/fajoviwoxomunodo.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/51850151072.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8c578450e084a877703fbbd6029b14e0/35610839811.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/85482004793.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/81ofp109b9kp8i5j31mh5j9d7j/74026869633.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610631ff5b8cf---zifovi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c02c732cf---52743786898.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/77176733644.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/lonotejefuvolix.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6607e3c8---xipowegutuxusewoduwutiki.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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 10872 bytes
SHA-256: 7c56b0827979d82a105e41cdaa60a34b06fcb7289cd1f7feb0f1b78d7cb56763
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 17936 bytes
SHA-256: 5aa8a61eda2e5314e668dec0c5a31f97846b21846f955ae47de5cfc9fc54cf23

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