Malicious PDF — malware analysis report

Static analysis result for SHA-256 c437007ed9c7084e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 15:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a1e77410b60e874319d047c8c0928d3 SHA-1: 356693121b264ebc8860f4c4cf0529ce1393f0f9 SHA-256: c437007ed9c7084ef06c6f9e58f5afd6e77a527d6df5810ee8642f21f7e99db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aimhc.com/userfiles/file/pazukalapinimenedar.pdf In PDF document text
    • http://iqlacpro.vn/emotive/upload/files/lavivelili.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/95949968010.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/pebed.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/wigelomeroramelasiz.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/vowaxosaja.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/64203293801.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/demisatinatodefazopotu.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/74309941665.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pewamupufubefibidalidu.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/bizadow.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8o9sp7tl4nr1jrgva8podi5bp0/sifabafurirelotamafil.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b17c4ccb21fdf130ba362ad2437fcd3/zozuzabufugepateki.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/20859201886.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210814063151.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/54076540063.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/42f3e1f4e331daecb8e7dee9f21d500d/59286222551.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/13406132038.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sa8brvrvpqugmifnm2gi3hce53/jewetefamadakasenupobavut.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba37aac8f5---81360370522.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/46936614251.pdfIn PDF document text
    • http://davcpundri.com/css/file/bokuwo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bbc2445b7f95b4abc30a3494fb884ec9/devazafukisipadosiwuboxot.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f3970a31---zopuz.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/dovuzik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=salpingitis+isthmica+nodosa+pdfPDF 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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 18684 bytes
SHA-256: 03c5eec823c472b7143737b3a46e2322ce4b9f28f19ed6c85497e303631d279d
font_02_sfnt_off00013304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 10908 bytes
SHA-256: 75950e0b2e9d8fdeed05d7407524adbdffb9dd73de8182dcdd9ec6869a7bcdd5