Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fcfe992ccdd6f3…

MALICIOUS

PDF

110.1 KB Created: 2021-07-06 00:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 953dc49fe637abaaebd8d35717be7342 SHA-1: 831d87c0658124d6651d416741766cd52bcfcf13 SHA-256: a2fcfe992ccdd6f31023409939f02ca82f9ff4bdee11e437414909e9e5ee0509
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://crysiq.ru/uplcv?utm_term=in+a+three+phase+controlled+bridge+rectifier+with+an+increase+of+overlap+angle+the+output+dc+voltage PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0e4c313c---kogogufisikaferez.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a6070srmf0fgl8nnfkj54ntcf2/2810342962.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210626065333_1612167888.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/zuwagigusulotikotawu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zijovodevuluzativagudi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13510e956---ruvabalajeke.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9f3fd4c862fe5f86e8609e68bd5970f5/rominivunufikolufi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be32b23b4---bilujumagatujamojibojeno.pdfIn PDF document text
    • http://dalaichau.com/files/wexukipufabugaroja.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/12821324009.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/jalamofotudebitur.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c4669abed67---kosoniwazogolazubazevuf.pdfIn PDF document text
    • http://veribase.com/E/file/98605309343.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/95834c08d5efdedc4495424063dbb81a/57001689875.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f37dcc7d---jezasisuzunesadadovawoj.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bdd4bc303de9d4ebeadac0139fe2808b/52584916157.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u3m0ab2isujgrvr472mkj3lrmp/pururigenalulaguxovoludof.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zusoxekebolun.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/argk7ih92vp35r1i16eec47gl4/lamupobe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c792664757d---57172776543.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/rematisaj.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/057e30ca1e900fc18ba85c4b4ef6b039/bujiduzufotemixem.pdfIn PDF document text
    • http://www.bash.cl/media/file/rotuzorakefusow.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0811975b---vupovejefopowivetubek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 20600 bytes
SHA-256: d95cdfbdc5cbaf862da7a39eb184dfde130201e8e628ff441bf61f81a63ac802
font_01_sfnt_off00016224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16224 11244 bytes
SHA-256: 5b5158920a96409cc89c02b8591dd0cc832a39b33e988fa161e90677a865e283
font_02_sfnt_off00017c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001941a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1941A 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9

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