Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b175ca13613a03…

MALICIOUS

PDF

90.6 KB Created: 2021-07-01 23:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5bf77123647a74aecbefb949750cdee6 SHA-1: 3b58cc882d878a22cd6edc45b8f82be423908f68 SHA-256: 40b175ca13613a03a48438c7d723070ec35f431b28e2861e4ab24cb5bf194ec3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document employs social engineering tactics, presenting users with visual download buttons and QR code lures to trick them into clicking malicious links. The links predominantly point to compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=12th+computer+application+book+pdf+download PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f754442054---84618830835.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/12574208911.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d4cd27dd116031ef82097786cdbea950/37465307742.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a51ba27d4---88123200249.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wofimutage.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/kegija.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/64620125558.pdfIn PDF document text
    • https://windsbs.biz/files/file/89040200254.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8e26bb5e---voxasadu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095578f8f3eb---52712334912.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb578b3b22---63044677965.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cec77d389be---salawinefuwifipibem.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a3823629c670f59787624589b341ad2e/pizidipi.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/nekasiwazuzadosalub.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/iap85h7jkfc8pe1ucoehvk1hsu/69761661880.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/44567945569.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0eb4682ced3490d9d4d4d42c98718030/lubinukikukebag.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/79278878a74d533df0c5be325faaea8e/kunifepidutotugiwuzej.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e8d7j62kp9j7rqnh1mrg7kqrri/25295353742.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0vh2e2siedgqtcdl6ti214tgn2/49495857181.pdfIn PDF document text
    • http://thaide.org/userfiles/file/29082650281.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f962a51285da8c2db57f0ce23c521bb/rikogazorivebuzugabitof.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/zoludigedonewemo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609959c4a9712---xexawilinebixofunefepudix.pdfIn PDF document text
    • 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_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 17144 bytes
SHA-256: 808339d2a7a2ed80ea9f97fc2e16a284dc6c4ac8b9b770e7809bb7379c42dfdb
font_02_sfnt_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 11212 bytes
SHA-256: c0b91bcf93d6f5b1378a5d588146f95bdeccdda830546232aa4e6ef1e3842472

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