Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a651ce38e5fad8…

MALICIOUS

PDF

79.1 KB Created: 2021-08-28 05:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfa002cdbdd66695e0d2e6847f10670c SHA-1: 58d4629587cc0b61670ce2c216927022aae792c4 SHA-256: 54a651ce38e5fad88e4c344bd5b9f37d499907e4495affa7042d100f64d49f45
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://alexanderkanevskyartgallery.com/clientMedia/file/zaruwojav.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365e872bec---55457304230.pdf
    • http://wxmx.cn/upload/ckimg/files/202108140436436156.pdf
    • https://ancoraeducacion.com/images/bixupokuxur.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4c17347f---64990614106.pdf
    • http://bielle-srl.com/userfiles/files/8387592193.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9jiseddj9aaq83cdrmhvmcmso4/6008537628.pdf
    • https://danielstrehlau.com/userfiles/file/fifetez.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b878a875---zonuzeb.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2spkt8c1g6v8n0u6dhfc052ok8/turiviwum.pdf
    • http://style4.allwebeasy.com/userfiles/files/xobir.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f47042c6---borogexafetepudigofemaf.pdf
    • http://sahamit.net/userfiles/file/sipitizilenizesefiwofulak.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/41991440145.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8i6kn6m1hfgok4cp0gvtmprf27/witexabazu.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160847a2f3c088---dupoj.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/76246060170.pdf
    • http://baobianhkhang.com/upload/files/jebudunazegiwusowazefet.pdf
    • https://gifarlcm.com/upfiles/editor/files/92421531234.pdf
    • http://sanfrancescovet.com/userfiles/files/miredoberaxinimugozewak.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9bb0bce7---58840221092.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607637b0d20d6---xepirojorediwugesipudisa.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/f2a4sgke14sfrcmnpl212kulo1/56492258885.pdf
    • http://merklink.nl/site/data/ws/files/26292674644.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/83938668202.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=giddy+giddy+meaning
    • 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_off0000c4e9.bin
8c89a0a5969e9d2f364a1e6f583d81e2aafe266d7452cd846a4a39a1037b6d68
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 22072 bytes
font_01_sfnt_off0000fe8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 16792 bytes
font_02_sfnt_off000116a1.bin
5a5c30276887fcc479d93166ed962ee0e0fd1696f2454ee123ed4ccfac9edfac
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 10212 bytes