Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31a0d91d6976e6a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 08:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f95050a9779f3061b061adbd065ea638 SHA-1: 9312fd9d95291094f495ad21ed2ad660eb6ccd1e SHA-256: e31a0d91d6976e6a11bf17894db1546a63afdabdf2e911e01bab2de0eb1313e7
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other domains, suggesting it functions as a link farm or redirector. The presence of these links points towards an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7c22f468---fowupobobuxuwavaju.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/909fa353bd96917ac287625561e40bb2/bugoroseresefunuxu.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/50041861513.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u30logkscrtmo3nigm945hjcd4/mamulepaleredowimanojo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///bujeluk.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/43252850766.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-28/20210728081320808774.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8cac04c1cb51a586ad121a2d2c5aac99/xobevugina.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c699616925---92236818542.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610861ff18ae3---55428909092.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/90170487386.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dd05699e10ef86cee753590f7311958b/nexuvudatiniwuwazorenut.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h8gr1kv871bthgjoo29minrenb/minatiwumurivomavivafap.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pepawuninoweweno.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/44270537699.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/59987805578.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612bce3a9c001---81548721557.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5594d24723e29846df07349e97bf6818/novezopik.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ctvqu3q2sq2ikelp72s4mmkgrc/19918446498.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaferirarikedux.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/10527257410.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b1f67d8552b65f8f9b6261e71a6a7c30/41716271426.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/dorozezedinovexozakisuwu.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/4037721760.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/4645953567.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a4793ce0d25b827b7d4f6433183727c0/71595623575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kanaka+mahalakshmi+ashtakam+telugu+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_off0000b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 10908 bytes
SHA-256: 017f1169e5a4fbe3fd49cba391de5fae879fb333b8f6718e5472552554b8de01
font_02_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 16608 bytes
SHA-256: c5d19b4d07c920f029f609142ee09c1926534370c54aad652ce9eb3e1c0a534a

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