Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cffbf0b885ced7b…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 10:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 969621f67a35fd45798b76e79d461926 SHA-1: 3f293bbce9cb5857ec6ec594418fca9b6885049b SHA-256: 5cffbf0b885ced7b59dc812835bfaa5e961eaebaecc09d1c58c9f05d67646b2d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to what appear to be compromised WordPress sites. The ML classifier and ClamAV also strongly indicate maliciousness. The document's purpose is to lure users to these external links, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97abc43c6---narezemuwuponitawoxemuno.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4160f53b04f9a0f1c3339d2e8722b251/ridamaxinu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00a2e3ff9---83227070642.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/un7a4f4fr3dedsu9ati61p6pr1/57699955117.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed880c66c---37325634977.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/453c6fcec650b6367babf75fdd9e8606/lokod.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094375339e11---gapelepon.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/90d35047b64c4b79a770588c2732bbd9/66513549198.pdf
    • http://imi.vc/upload/files/68972167372.pdf
    • http://dolphinkorea.com/files/files/rixobomofovuk.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607614f97e400---26069968297.pdf
    • http://nct-vn.com/userfiles/file/joruvulafubajumikufazokop.pdf
    • http://patp1ryb.ru/media/file/38493433012.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081515476d10---84847904682.pdf
    • https://serini-cloud.pl/uploads/editor/file/migesimupofo.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/p45stmu26i8bm7ereuuj18daa3/30420288948.pdf
    • https://red-adlay.com/upload/files/zuzidarilem.pdf
    • https://wolfgang-photography.com/userfiles/files/lajadutudegig.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nn8c1ptt171u2ib0e0tei5n4et/60399423001.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/de04b38c7b92d1e95645f6e5e32671ee/diruna.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec9b0de9c---40356509605.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5396b03ca7---72621162805.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099efd3bc3f4---siwabugabudugapifiw.pdf
    • http://alnadaoil.com/userfiles/file/41098876111.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b727556ea3b---gorozanujufori.pdf
    • http://langeline.com/ckeditor/upload/files/14644742422.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=howrah+to+airport+distance
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ce.bin
9354459d65526ad5e09c5f1cc9f4dd20888911d369caaaa140db82556d0a015b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10644 bytes
font_01_sfnt_off0000fe2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16792 bytes
font_02_sfnt_off0001163d.bin
fa15e77f17d8b95f2d74d56d9699f5444976d8810be876e355701f0dfc00b817
pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 17064 bytes