Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d76bc7376aa09d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 10:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e436d6ea279f078dca0029cad967e87e SHA-1: dd3bc1ad5e436727f2f57ac91c45a61286300d35 SHA-256: d9d76bc7376aa09dc942ff020568c2862dddda8e4a141fa1933e30fcba88a84c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=android+save+contacts+to+sim+card', suggest a lure to potentially phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=android+save+contacts+to+sim+card PDF link annotation
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/natugugel.pdfIn PDF document text
    • https://felicityokolo.com/file/fawobesugopekelija.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/15925818357.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/20551222497.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161348366bf768---mibukifapimolinab.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/lopamitadubetugupu.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/lifudov.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tesakutefap.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19944389830.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/wuzate.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/vamalifu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca68750673---vitenosidaxojesenusov.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/93655bd1bcff86a29bffcbd416567f12/devozoxe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b41258fdb---50380122075.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/mokelu.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/11674960715.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/sinukifa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d37d8e06ec1abace9e6c708a5ce78d02/pifiwisuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e857ab3ee---zawija.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109112107249962.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xasuguved.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zogaduwidodikuvuna.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.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://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_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10532 bytes
SHA-256: fb713574e8cd5be308762f9c623985214f833d8563a51e0b282f5934dd58107c
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 17616 bytes
SHA-256: 61986e2fff0c2ca075e1bfd4d00ed7bb9fdf8437eb2b97d4cc54835f64de04f8