Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1c84906ad4f94a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 22:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 639c21e28cfe44408039a4345e1a9e54 SHA-1: 865553813c372bbc4df47ad2e1f51fb77b9d8dd6 SHA-256: 5e1c84906ad4f94a5384905fee36c6d6b0a884031f51d2d2d7468697e5de307e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, likely to distribute further malicious content. The presence of multiple distinct hosts and the use of formcraft plugins suggest a coordinated effort to host and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea9fa6eb3---15602206436.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/662417caec3b9e7f797230f7581c8c4d/42170779566.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/49711600519.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/buvokovelozozaku.pdfIn PDF document text
    • http://canvangdientu.com/images/file/japuwesawu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/306a30bc8cb3b93a06dc1e2863365ffb/benakedogo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2el53jb2i9g6tdmn9t3e2bbtgu/94078883040.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9i7pbssa2qkn83gbrknrgis2gt/5441494583.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/67914551781.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/78469725563.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f21470a54---91219061614.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f1c40e433a63fd8ef62b84782fec5f32/81136677419.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c83136140---15699588533.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a7c4ba5a---fotirozuvaje.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb3e9b5ae---64096581478.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075458f5b77d---savamepodawigovufumu.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/xuludap.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/bepifagezajomiz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d8a958bd---kapoxaxebuguduxedako.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/rotibokikutarununefalanam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5008565a8ebca243070e01686881acca/zafogifuwupuxazetuke.pdfIn PDF document text
    • https://aedwea.com/upload/foto/5556288204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ethernet+mac+sublayer+protocolPDF 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_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 10884 bytes
SHA-256: 0f3cf82a727a7bf74dbb7b31180ba45f4dbf72e8a9aa4bf8356447a2bd04c118
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 16572 bytes
SHA-256: 7288aea2bfdf714d6f7276b9c4f106a3a6403c8f911e2205e52d0106ebac2eff

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