Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5c9bc3efc1c790…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 09:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 596f3a091d711717337b1c196ec08459 SHA-1: 05cc6ba121c67f347dffe100db208b3e0cfbaf88 SHA-256: cc5c9bc3efc1c7901447002667c2215db1caafa2ab3f2a16ce5e309b4f5b4893
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm and a QR code lure, directing users to potentially compromised websites. The presence of multiple external URIs and a link farm suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://perfecthospital.org/FCKeditor/file/lukiverovoxuwemumagukum.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5cb4a042fdc2883ec0db7702360ddbca/sijukevodulajezular.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/wufogiginumusereri.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135edf65dbf0---42959862856.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210917172139.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/lovoxilibusuwajitik.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nevibikapukotiru.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210905060258.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614111c522d07---4637546583.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d93c71b372615ee5622ba39c0824898c/29445814875.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/pekexaruvotu.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/70328631109.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fbc07e00c---wubexosafetomafewenafukug.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/foxopujofukowamala.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907200856.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/fudiwosulususekudupaze.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/31145029634.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/petiverejapubunepijebog.pdfIn PDF document text
    • http://cssh.es/img/file/6642904932.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/sisilezuvonugogudufagasow.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rexuxowamibowekogoxerogi.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/79316834136.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a3e742a0b8605550b1a7d4d6aaeebff8/tolowanufuxenudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+recovery+cannot+load+android+systemPDF 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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 17764 bytes
SHA-256: 82438ce1710f8a3232e9d46cc9d7266ff26b2f53d1ff3ccae372700689372c61
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10692 bytes
SHA-256: 13b83f8b475eb67c5519b7e98901b1f1a9e185e462d1c3a656bdb8c3378bc784
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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