Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5093b2788815c0…

MALICIOUS

PDF

86.2 KB Created: 2021-07-21 09:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a8bbfb61a1a1842692322e4403b4af8 SHA-1: 2bfcca5adc2b47ef9157c7f7d77304321ee997e5 SHA-256: ae5093b2788815c0bb9e22da06e833320331cb0fa2396bbdb6b58e57d56c9869
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also strongly indicated maliciousness, specifically identifying it as a phishing or trojan PDF. The embedded URLs, while numerous, are the primary indicators of malicious intent, likely directing users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bancodevida.com/bancodevida/admin/images/image/file/78933441904.pdf In PDF document text
    • https://actorconseil.com/files/file/juxasakenuxijuzu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15248d8125---fatakakot.pdfIn PDF document text
    • https://purefeeling8.com/data/file/zaxekokagutokapukopafofek.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f15c91561---buvuw.pdfIn PDF document text
    • https://wsbtitan.com/images/file/15018472488.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269735d2d2---xofedimapiror.pdfIn PDF document text
    • https://scalper.ir/data/files/file/pidozoxufezivebezutoruw.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0bdbe4ee9---nidifewik.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4551ed41---81656140532.pdfIn PDF document text
    • https://samudra99.com/contents//files/rigisilo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/55525fe634d2632605b04830822005fe/14563257418.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/wexujero.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2e55oav52dvtogkqoh5ou1q81p/bajebapav.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929d52d48c9---jiwulavewuloditug.pdfIn PDF document text
    • http://www.77ice.com/upload/files/47033905597.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/25422947076.pdfIn PDF document text
    • http://4bx.pl/public/file/79645228402.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tudejalufufamekalusonexa.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bi15cpmpiuvcovra2q4gfn2n83/sezabojabat.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606facfeb599f---20175531199.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/349fgjbh9gjrkavnsvjtjg97m1/jonakabapusibe.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8a3245cc---xivumelagat.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1626536199.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/pafesuvefonatira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=definition+of+culture+identityPDF 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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 17660 bytes
SHA-256: f6ad54510872b7143d32d6a730ee27a01e0be9fe83519913d69242c3cbcff966
font_01_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10352 bytes
SHA-256: dfdeb43e1eb3a5b203de71c2ecd7fb114c431c75ce0b609aa4100a554b1c70cc
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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