Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb220d4b26a5846…

MALICIOUS

PDF

88.1 KB Created: 2021-10-05 15:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16371a26480ca2297ed483ef9436d7b4 SHA-1: a372019935e1316ecade1d9839d54f486f0bae0a SHA-256: 7bb220d4b26a584606d5e2236e59bdc0d0f406881262b507b78275d0d0e9f37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://coretry.ru/uplcv?utm_term=incontestability+period+meaning PDF link annotation
    • http://pnktools-th.org/ckfinder/userfiles/files/25348471425.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/92858174490.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/kinevobuso.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/15441590142.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/19657019393.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/47429914401.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210919225303794.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370b16e986b---16597551572.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/66181638781.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc2dc37beb---19350063660.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/60988822046.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/54283242762.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a1717d9488ecf9648d49f54f302dfcf6/66277642874.pdfIn PDF document text
    • https://iword.de/userfiles/file/70188791793.pdfIn PDF document text
    • http://jcpingie.be/public/files/poxofalesivonotafij.pdfIn PDF document text
    • http://vinmexindia.com/uploads/danifewuwi.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/14545487445.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/10595699309.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/rabopokujira.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jk2auinmcfk3qq01co35rkkg83/xefidemimura.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/rawetilobovi.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/75491567695.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 18500 bytes
SHA-256: 41afa0aafa63eaf09f828d21d5530cc3e85277b660fdbaca497d18e5d0103faa
font_02_sfnt_off00013975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13975 11060 bytes
SHA-256: bc4c89ac5fb0c15c9abfd81c4419dc7512c2037f819a7022d114c1e403039fd4