Malicious PDF — malware analysis report

Static analysis result for SHA-256 006a1755b2a93984…

MALICIOUS

PDF

120.9 KB Created: 2021-07-07 13:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 378e7675226aa304c0c23b387e703260 SHA-1: c29a378b629df799651b4cffcbf72801927e670e SHA-256: 006a1755b2a939848c75b6f2536315261c5bb18a34bbb7382f8eea45e41748eb
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83f95e977---36240461300.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4e16f64---peven.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2decb6490---mulifipiv.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/fixolenisekonarug.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/ledeketumikizimi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/bumini.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0bdb4b23trqq8vll951stll2q7/jugagaloke.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfada138cb---48381155439.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/vajibi.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/38889050581.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4755003e37c8e15a1f8e65fe18654ffa/mamozexerimodadem.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf98d9f01---51335166978.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qgne89gilh7nq4euun159nikp3/57508258192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16883f4fb---joxinozivudedimabaxi.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/jumilefivusifesexuvesuwu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/79958979938.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xovotegelonoxulaw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a9b464c9f44fc749a868ed4d2e2252d/jojat.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/6375974151.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/gagumowugedeletewiwas.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/250857856.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/73113976234.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/divemekovevelakazujetowe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085055557314---sarexesazavefezijanuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=graph+algorithms+in+the+language+of+linear+algebra+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_off000170f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F2 20376 bytes
SHA-256: 8f38c0533f6fa2acf3d46d010e15c62470bd3b5fc267d52c6c7ecd4905530184
font_01_sfnt_off0001a3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E4 11224 bytes
SHA-256: 29a1b6dd13eeabacf59d8b2ccf18717bf1960269bfc8176a81ab380674756520
font_02_sfnt_off0001bd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1