Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abc46d14bed514d…

MALICIOUS

PDF

93.2 KB Created: 2021-10-11 14:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f834c4c985fadb276ed9666365029827 SHA-1: 1883a484781ce4e830ef40556887fa42b35ce59d SHA-256: 1abc46d14bed514d0f69e7c6e0e4633ba7dec8ce1e0feeb06233bb8a8e8402ec
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://loyallcanada.com/editor_files/file/bogobotilupatukuzasuz.pdf In PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_04257A8074A9A076.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/17870dc9a59a0db02b5d80f234d741ea/pepojenozesin.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/novawoxigogusagejabepokiv.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/fizegepejafekevovida.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/64162579018.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/33723626050.pdfIn PDF document text
    • https://3visiontech.com/piceditor/file/nizoxolimug.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/fidubaguretapumudekede.pdfIn PDF document text
    • http://intertravel.hu/_user/file/97052108133.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zafamagusizafi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///mututufapufogoxujuwu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd83d2b8cdda6d1b5712c4eaa4744e75/95284392655.pdfIn PDF document text
    • https://latework.cz/soubory/baruvevuwufiniledore.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/89106626753.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/93853403664.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/47298558049.pdfIn PDF document text
    • https://viettrungson.com/media/Files/31656088319.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20211003_10E9BB2464EA6DBD.pdfIn PDF document text
    • http://rurisnet.org/images/file/sowuzunabegumojirag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160b7fac202d---tizuta.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f136758311f453cb75a3a1cba3485dbb/3841023555.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cefdd136b8ce03930e749473e0577810/larof.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=how+long+did+it+take+workers+to+complete+construction+of+the+empire+state+buildingPDF link annotation
    • http://irodori.kir.jp/files/file/loterowefapufiporelexilok.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_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 21180 bytes
SHA-256: 40b452eccf25261387a90bb50f79a264f37fade0bd0d5c258a471828d5607936
font_01_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 11476 bytes
SHA-256: e18caeaae346588a89a623ad4face9691b1a53ebcfa498aac0a5b694ae1bc11e
font_02_sfnt_off00014dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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