Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a5cfb21034d792…

MALICIOUS

PDF

98.7 KB Created: 2021-08-07 18:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9dcf8389f494b238e7ae970cd3097a59 SHA-1: 78dfb6fac7d9def33d2bdb4fd72b934049240ede SHA-256: a3a5cfb21034d792b5461e34150dde255ec7506c69a3bc6ddd4e842e864da603
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or domains that appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=what+are+financial+goals+examples PDF link annotation
    • http://aktifithalat.com/resimlerfiles/darilevon.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/xobij.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d072e433df6---ketijefomazix.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/43168328322.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulademovefiwejame.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdea70f5e---59928306516.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bf866f922---turowomafanijopovulilitok.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8e502d3a824923f566d2877c98657a37/45450102903.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/28062434121.pdfIn PDF document text
    • https://laps.pl/userfiles/file/16828713211.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726700de7d4---9932328269.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021051703331984.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/90860303284.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kiwigoru.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/ladavamuwil.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zivewugase.pdfIn PDF document text
    • http://huiking.cn/uploads/file/080631409093.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/bunalulugutunop.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/7220580946.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/70405792356.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2d773e7ea---6236893192.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/2333338752.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/10844614306.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0b9lequaoaqjg7vu1vfb95h08r/weputanosiwizumaxomagu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed34c41e8b---32294046047.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://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_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 11020 bytes
SHA-256: 39fe7a4e1f06ea5f45856350101a82f2deb9ef06818a5368bb0e4d1de4055229
font_02_sfnt_off00014c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C76 17648 bytes
SHA-256: 9e9666196c7fe36b83b16c8511f86c3e83b1b40a8262885ef310ceca406bea6e

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