Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e744266b90092a7…

MALICIOUS

PDF

82.2 KB Created: 2021-07-09 10:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a373948c14a24859d6b9ba88b8c52930 SHA-1: dfc2fc5db7ee853744cb01a758c98c18cf105da8 SHA-256: 4e744266b90092a7a61ebdf25c9a546ad364ee719ac8aeb7ada6196e8ec9bfb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hlh5krf3kb5fsfe9nei7ercp41/zanezoxuvajipage.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091192cc2c1c---puwupaditafozifowisepufi.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fabup.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/55641735157.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gs7ttd6cnupo6gi4sp949sl87e/2312122074.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/la8blb9nioa9k7e3501k47r3g9/kavafipuzejovameruwikid.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/mutibuxazezugodikilu.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/fcf8dc8912e4bbfb56cfb30fd71932ca/xoteke.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/89594182893.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc3b7dc215---98382276511.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2757783909a70046d2664193832c61ce/89779238672.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a45c0c118e7---fodumumokobapapibodulori.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4654820e---57244144847.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b39cd30416f28a4d8b97fe38bbd05a6c/dobur.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210516090533921.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7f21ec2e176a89eb6bfc622b032beb11/28507507650.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/pulawolamajavekuzas.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/lomujofowezawe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9e311df3295f7170a4698c5db3f63bc4/zenofukusetojo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dfed4d67b---45170094909.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/bifikozije.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/xinesigefobaposato.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/64dab0741b21f266c0cac6da8537b433/maruxenezufatowaxotinos.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/20085143952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=java+8+make+http+requestPDF 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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 10760 bytes
SHA-256: 16039970df518119de9ab5808e9038a12dfc8eccb21c97f17891b1cd23e113ee
font_02_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16736 bytes
SHA-256: 998f9c6fc00640991b576f807c460899b674f15b480d5840aa836a74ebeedd3f

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