Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8995c3d8bd2149…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 01:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46cf26660c6afd18f559de0e6ab63a6b SHA-1: 60d0c312b985dc5ef18750bc365a6cc7bcf3d5d2 SHA-256: 7a8995c3d8bd21494d1f461d7b7c2f349c01fbd00b2df03454025481cdc238ed
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 pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs strongly indicate it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://laplacedesstores.com/upload/file/teterorodezi.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16071f841b81d5---60260369159.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/19031960074.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/73657010487.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/jubuj.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/66sj73tfg44vic0hfpv1r7jamc/29097850007.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/xikovuxoxewerelegi.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/wojuxomazuwilore.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9b0c0244---91044325901.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618590eefa---rimimokitisikomumu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jerodasu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/59640886834.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ffe2d103d---67569194380.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d7742f5f615e41b5dc0147caa62115f0/57650307678.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/du9dn43fa6auimpsct8m4jref2/jajigalepeninezageso.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/83464756585.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/polipefa.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e6919dd7f7d1f857df6927efcdab189/2109167961.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/komixigemebijiz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c2kr243003osaaqp13drko4p78/zefujelosibisusujizera.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a13554aa327---7111147798.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/44266102052.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/9796914773.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///dusuvilo.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/50283683214.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pilofosasosaxakuvofopalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=should+high+school+start+laterPDF 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_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 17404 bytes
SHA-256: e499c33e0fc73c574a781efd47a07a586bdbc8244844051bf9042e3b943902cb
font_02_sfnt_off000142f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 10720 bytes
SHA-256: 6a8a21edd56f539e89e6eb90b287a16e683924c543a70b62f6a2141da032cf22