Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2cc3285764891c…

MALICIOUS

PDF

84.5 KB Created: 2021-08-19 15:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adb4b634896cc6fba2378cab01b52d65 SHA-1: 862d21ee840b0ec76e8648eba8a7562a79c60fca SHA-256: 0a2cc3285764891c5532ee4bbc62c891bbb648ecb7b6b4cd6485e500d9d53584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights the use of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://terezmisszio.eu/files/file/67330195684.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/20210702/210702190335695661pmpdpgmpiz3k.pdfIn PDF document text
    • http://klpa.net/userData/board/file/51018460222.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b9faa2c6---6159092218.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dumakalomipugin.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/dasivadaroxixenigunawi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/1cf348851fd62d84aabc03a56540917e/lapeposesuli.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/77744239500.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ajs5afk8njur8k8bd520uvh54e/winezibezavovutefov.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/59849122133.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/worofuruwexekuzuzusabo.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/xumemujifogazu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/14423000162.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v086fo2re2ioilebs46ehsvhcr/84805154784.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c808df9297a31a783f6b38d6bc932038/60273497709.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/dufuvulumusolutawusun.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc3552c2f---488181735.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/bizofoxuwikuboz.pdfIn PDF document text
    • http://headrepublic.pl/images/files/febenunovix.pdfIn PDF document text
    • http://agrion.org/upload/fichier/goximoxokorum.pdfIn PDF document text
    • http://www.siposferenc.hu/html/38270724145.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/12140814586.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/toxakezesawa.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/jegepijovekezapuremalijo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/29852676bca08a36da90e99a3debc2b7/vujaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+score+do+you+need+to+pass+the+firefighter+examPDF 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_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 11328 bytes
SHA-256: ad5d10910cc491e82a783bc43b0f9644e4a06698226ceb272d0792af4806dbdb
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 17104 bytes
SHA-256: 54093160d2384e0f1bc7a6b6a293ebe9e36e0887a16f96c5fb68bd85285110c8