Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c058c48ec3913ae…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 00:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b06e0322fe4cf46874260b279de5b2fb SHA-1: 9fe1b53dbc81ea4fee2c042212330efafcb2ab33 SHA-256: 3c058c48ec3913aea07aff57ecbefae8a100ce5ccb06a8a3a2e16a6f4108d103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.naturhalles.fr/fckeditor/userfiles/file/67931582825.pdf In PDF document text
    • https://medpressa.ru/files/file/tedumopojovudori.pdfIn PDF document text
    • http://palami.by/images/file/82475333890.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/waxibajozunabanu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506234929.pdfIn PDF document text
    • http://cx-gl.hu/images/files/sajezovikel.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zetasakurufowupibawaxanas.pdfIn PDF document text
    • https://werbemittelag.chupload/file/98435247832.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f0195c7e350341cdb1ee37448feefc54/34359864552.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/80115774136.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/91146042651.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/56404781471.pdfIn PDF document text
    • http://tencanpowder.com/d/files/98437874593.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/zodosivibogixemoresekile.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ed8404ba388204afdeb9b2d7ff8010fc/rurovuz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5788d1a2c719d34866b3a90b5532c728/fadigugigivawikuvizixok.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608173165b9b8---boxakej.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/52566369722.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/gejalafefixetubovinewo.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/40331567646.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/musevolijurotewulutux.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/falika.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607451fd523bb---dagidafekabawanowova.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dk5h74tjdehbmu4j84b124ors6/zuzitipimanob.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/26610012219.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160893bcdd0492---80288022221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nuclear+power+plant+pdf+nptelPDF 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_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 17656 bytes
SHA-256: 9725e5e134df45b8708f2d754d95bdbc180b188b0838196fb1369db89f198092
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 10516 bytes
SHA-256: 7f130e22989ffcc0c78810b097a04078773066e512ba73669486d4da9d9becd5

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