Malicious PDF — malware analysis report

Static analysis result for SHA-256 905617f9660418ee…

MALICIOUS

PDF

90.2 KB Created: 2021-07-20 06:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88ac305fd89b58662352f8a9e2e9e47e SHA-1: aa5d74f976e70ac67f68913a7d4eb13bf490a673 SHA-256: 905617f9660418eed97444a502f5a30794cf63804f0cb257b9e7f9b3210f6f15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic for an urgency lure further support this, indicating the document is designed to trick users into clicking links that lead to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e971873a---nibivudetulovugolamav.pdf In PDF document text
    • https://adasms.fr/userfiles/file/71506548530.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/83008061768.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/62278671619.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/29599311889.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/davabekof.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/54930282557.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/36143636303.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/nuzogarenarosisekusamuma.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/povofopikijajuti.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a23159f4---zeworel.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/73003410219.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4ffaadc858044478dd3eaa1603b2e714/38371528307.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/31000247012.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/80778742115.pdfIn PDF document text
    • https://people11people.gr/uploads/File/32789803195.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d7fb6419db2c5309fec94778a947cddc/guged.pdfIn PDF document text
    • https://aashianarealty.com/file/kapodunududamijex.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ad830d5f---bisanuzabe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ece7872be1d---nalomof.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/254463c1f71025c45c438353b2ba8caf/vubamemu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4127ec95---xusefalipusod.pdfIn PDF document text
    • https://bloc-immo.com/images/18519734614.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/punivuwoxipefopalosaxira.pdfIn PDF document text
    • http://jkohut.pl/file/wiwijatibilapajofaz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075a53250550---17832714744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=appeal+letter+redundancy+templatePDF 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_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 10488 bytes
SHA-256: 7e3b48c6c7ca5c7ae9fc07277f7520f92a8538fe331b239dc1f367fd8dec54f5
font_02_sfnt_off00012ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 16624 bytes
SHA-256: 263ce13760dc895fac4123318d0e8590c71b25193cf2d620ea5af19c3bc72e4f