Malicious PDF — malware analysis report

Static analysis result for SHA-256 071800f409931ada…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 20:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a5981fd4a9ba2215ead859d4f33b6f6c SHA-1: 5694949936723c12b592914afa15f1529b3ace65 SHA-256: 071800f409931adafa0e321f4a3efefbd4b0a77ecfeea76d17e30e8b355a6538
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with several pointing to compromised CMS upload storage, indicating a likely phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://polaria.cz/images/file/8258631059.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xemusiler.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/pigabafibo.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tenamezesujimez.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2c11cf7433d6c33168043d8bd3d911a8/12254669154.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/bovinakopunis.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210924_1F0EA74C04E7CCF1.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210917181521.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bifido.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/894873319.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zajivinaba.pdfIn PDF document text
    • https://turbooto.vn/upload/files/kedabavidubevapizoforugoz.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/vikanufeguvewenu.pdfIn PDF document text
    • https://majubesar.com/contents/files/wesogogekilatis.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/62902412041.pdfIn PDF document text
    • http://specimport.by/files/files/75197012888.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55223353623.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161427e8a71d39---kawogoxinidinemovefipe.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/jarakodefugodepufutogiri.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161534c3f65ce3---zujijuferomogelis.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/tokosogoxiwuxozuxisulu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nugolezemafugopap.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/34e21391c05d1b3f570c8fec8466e0b7/kafegubedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=asparagus+in+foil+in+ovenPDF 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://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_off0000af9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9E 10584 bytes
SHA-256: 41d4893b5b7c7e2b4a60f81564d5fbb458f678c5f2cf572e9e58a74e8a801185
font_01_sfnt_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 16796 bytes
SHA-256: fff45f8835481dbd267426b2ad18ee0e1bcf2d68c62a993fc98fe39ab79ba686
font_02_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1