Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0146d6cc691360…

MALICIOUS

PDF

84.9 KB Created: 2021-07-13 14:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c01cffd034fded6e831fece0fbb5d099 SHA-1: dc736466fa7e0dc5e091ea82bdcc6d9f2169943f SHA-256: 4d0146d6cc69136079f003d1592c9d6d0491e92c692803c5eb8fbbdf7a6c625e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing attempt, where the document prompts the user to call a phone number for a fabricated issue. While no scripts were extracted, the PDF structure and embedded URLs point to a link farm hosted on compromised WordPress sites, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b52ebd459---toxanuzipik.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/65425613387.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kqm9lplmn2vuq1qt7vn0rf7rkn/29608815716.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/26989750178.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc552b090af---wobetitef.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/potun.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55280d006---xujugubokopana.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210609192424.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/88a8e7768bb7b5a72b402894e3827d95/buboworatuvokotijexa.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/749baa1472095fb4a65438efdef0547e/67014573825.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608502b0ae100---51121244149.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/ledab.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/vitubebibipaxemipu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/64783865754.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/60707131203.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/462290be65d91a770957804d81f65d7c/zuzeduluxogoxaxazekijela.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061901431639.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vugawunizu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0b13b22d2b164f706b0182f115c02f92/51341797878.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eff3467b8---81284723804.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/44209e2a92e2de8efd405b4597649a69/82944660251.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d3a3d0c5---bidira.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/11557e4e4e2503f1f77f38520109fa75/92955856438.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eu1tj1clb3m1vqtfgnpa31eaah/94120535355.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/769fec416aa95fcf6188dbe91bc83b42/zakebajoderujufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=scattered+punctate+calcificationsPDF 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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 10788 bytes
SHA-256: fe3e5320e8a9f18004d8dec8a783a087dae42429e0172bf500cd10c1d81506af
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 16408 bytes
SHA-256: 2485f1b3787d4e29b8f51f436442b11e5b9361b64658358c6efb625f48c40e78

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