Malicious PDF — malware analysis report

Static analysis result for SHA-256 566601720b586a9d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-14 05:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c68b443743e57aaadc2414e581505d91 SHA-1: b3289c55f30635cbd7fbe41fa6cf1f2ef0df10ff SHA-256: 566601720b586a9daa5fe2007a3867a19ac5c201b39579399b9a88dc2660db36
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/32c2425fd3bcbcb3dcfd830a28a0fdbd/robuxefimos.pdf In PDF document text
    • http://www.chatanakonci.cz/userfiles/file/79748768445.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c20bb655a---83097985328.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160acb92cc9116---93573650847.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160778bf3f0927---9759637527.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8789f39b6c---ruxitufe.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/67426069313.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4237b925---totenadarebabomijilodatas.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbffcba408c---dosopaparogudaxaduvovola.pdfIn PDF document text
    • http://abnicum.com/files/file/26772600507.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/21069175789.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/06f7417e31ab5b6a58112617b6f73a4d/xuzuzamuvubosa.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/gebizenixekezilafibixudur.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6f09fcc3---xuwisigawuguwunini.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83667f047---89386884135.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/wefidejilaforozam.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceadf2c872---veloralovubopujunuwonivok.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40445aeb02---momewelizegadatap.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/54360295080.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/rukemezanonigufu.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/32951365313.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/61359389346.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8faa337b---woxaxinojekefajakugejun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=y+se+word+meaningPDF 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_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 17788 bytes
SHA-256: 35668d663a074a61d7889299d7e427ed932c45c5288afef025d4b611db64a72c
font_02_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 10516 bytes
SHA-256: 433d0b146f28e8a2995aad28cdf7405dfda2dbd3badb41dc906988f76c49e648

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