Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d3a73a12de4a1b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 17:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 416f57c966dc35d5c05fbd49efebc6f4 SHA-1: 6b6c7c8de76b66f851dada1234227a59e754c655 SHA-256: 56d3a73a12de4a1bc7ba3ae413328317283f0d95858e5f588b6aafa4b5101487
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://mygo.com/ckfinder/userfiles/files/xuxaruzosavowunevukajiki.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d22e5459a---13938898429.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e20760ea46583f5605f8add7ae7c1595/polatilu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f325d5c85e3---letekujagomukipupa.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9cbb41fb---66752132604.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/kapilute.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nemapolut.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3ca0ef41---60048119094.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0239c259e46fcdd7e09ff1ba2ad5af1e/45383404055.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vusiwinimelitefibiwelibut.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/kojovojuden.pdfIn PDF document text
    • https://synersys.fr/contenu/file/gufaj.pdfIn PDF document text
    • http://allycatering.com/userfiles/80961916018.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec35e6354---48336979084.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee7bf376a---femupojosutusu.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072505534773499.pdfIn PDF document text
    • http://kasargod.net/uploads/file/53269429031.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/vaxifikateragulidobiwak.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///58894166981.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792b3c34c8f---74771676345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ieee+standards+for+earthing+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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 18708 bytes
SHA-256: ad80be4cc2114af766f2950e2385407d5cbbf298d98beecf1d3f0d9431581029
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 10684 bytes
SHA-256: 6b26d17e5fd91ac29f0faf7d19c6539b82716b4e843dc8e0e7bfc09159430173

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