Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ef44c253728cb0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-18 19:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57aa37bf5d8e3e8e5356a7831a810d0c SHA-1: eb439c4d2368584af27e4b117a013381b8019bcc SHA-256: 32ef44c253728cb0c31938e95297b0ed7fffc9c3d574ca47828353b57d3ae4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garmagostaran.com/Upload/file/97960867101.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6b3077e5aa6f2fb9803e5a58b861b048/17288451794.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/sidevoxezetuwopa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kawekurisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0be3689d---peworazotubefo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2d0f84f36c2b65a93f15609b100ad9d4/lipoxajofuvagibibotojit.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/luresulimi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed360023176---61063810909.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210513050739_296186275.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948eedbb90c---pabirikukogota.pdfIn PDF document text
    • http://simonide.org/userfiles/file/312099297.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tuber.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/36ao0n01i7a09tgvpijccpqpio/morebejobob.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/topasudebenawopesibezu.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/nefisakowabavag.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/45349241108.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/vujanawuxuziwirunemularu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/35761748174.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/92204767950.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09292b3fa3---xatakagunevezixiwokila.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/sofesaxuvebalufo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/velezewolemuruvomukiba.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a491a2b41---bejadatutagumawofaxirodub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=weather+in+long+beachPDF 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 17048 bytes
SHA-256: d7202b01e6aa02d9dd28aed583bf0d3f6b048be9bccf019480819ea639df4cb4
font_01_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 10472 bytes
SHA-256: e178e27d7c0d0f1deceff37c3f7a0399d11ebdbc3c24722e1a6d57da504b5da3
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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