Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de2c819d2652050…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 16:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 46279cb26f78f5f3cc2990cc25628475 SHA-1: 5891b14b1905243c8868c7b479bd47aa744ef528 SHA-256: 9de2c819d2652050a319796b3720df01703508bc8ca82474057c2b8485cdda2a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute malicious content or conduct phishing operations through a chain of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://poorclarescork.ie/images/dotenozotepibevisujuv.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/7319489219.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/32019922943.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a40fd2df313ceb94c3403ed496a323d9/libuzotejelupomo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8705e92f---fegutafoworelufujizo.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/88f908942ab326e6655a684a1635adbc/ledenupafemixonomunej.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8fff9ca7986c499093abe63778c09b5f/mukosanuxi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0be69c641e360415d0416bf8a73ebde7/wavijupofojanoxusojez.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e3db060c---69573168791.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073710d49b8c---14881374988.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cb7cd37f14bca24d43b58794e3528472/xaravigesijinazu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bafv3pkgnb3otgrmdms1dbdo2a/9221513414.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5bcc1975---56787642965.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/af315ce06e162eb76c5283c49cec0c8b/91399654174.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d21d18d15a3---85271400757.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/pasuxog.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/reniretiju.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/55846886842.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bcf3a7f24---dinegodat.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/epm1rf81vuiova3bb7edv8q6ir/61604898316.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/72782628992.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/44272411571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=inter+business+hotelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10236 bytes
SHA-256: 81ab9a15a522fbd754dc4f7d5808be06f46fab19fc7cf8e89e020df88544339c
font_03_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 19476 bytes
SHA-256: e8d25e09d2eda69e561d504ef57755d9d8754bd4d1f753d30ecc38a185944ac5

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