Malicious PDF — malware analysis report

Static analysis result for SHA-256 5856ae425c40b7ae…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 22:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b802b1da2371fc3bcf17917a75c3a8f3 SHA-1: 8f693b792c00690bc8029a5199618857c0f05df0 SHA-256: 5856ae425c40b7ae354ec8b762d13393e2eaedcd0730bfe67f1ddf2a868877b3
176 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed numerous embedded URIs, many of which point to external websites hosted on compromised or disposable infrastructure. These links appear to form a link farm, a common tactic for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://activepymes.com/pub/file/fobujatuvazobo.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/69539955748.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5b850bb0eb3d15cb28c7fac68090b312/28115023965.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/47800831538.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b03c21dd---54230925193.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/daxodaziwuvatamatisaluga.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/48050064388.pdfPDF link annotation
    • http://probeg2000.ru/files/userfiles/files/14138848133.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kgnqofb41v9qu5hcmt75cq2hs7/94426737209.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/94327374845.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/36532198181.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ac3f32bd4a5886cd81279559e229e0d9/winixasi.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/nimobago.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/mumefafopipizanupamik.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/sugijojipejekitobu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/marugewakinevogem.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/gowinilo.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/nidatikaralu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/56117935497.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/dekunudewosogururajojeji.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/83566673966.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/sisovogepebijadenuv.pdfIn PDF document text
    • http://coffee33.ru/archive/file/44871091637.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/9777032323.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/gufuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adb+install+play+storePDF 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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 17360 bytes
SHA-256: 4c894719b2066e2c48b06a013ef98bb7c4e7bde4ce5b1452a173b1bc56ff7c33
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 10620 bytes
SHA-256: 85b57f54549bbd6e617fc27f2109b8803e290054e5bc67620cbef3e3f77c07c1